This number is a prime.

+ 1 gram equals 0.03527 ounces, and 1 pixel also equals 0.03527 centimeters. Note that 3527 is prime. [Wu]

+ The city of Karachi, Pakistan, covers 3527 square kilometers.

+ The number of ways to fold a strip of ten blank stamps. Note that the digits are distinct primes. [Beedassy]

+ The emirp 3527 is formed from the single-digit primes placed in the order of their first appearence in the decimal expansion of π. [Silva]

+ The earliest prime digit prime containing all prime digits in the decimal expansion of e. It starts at position 1638 after the decimal point. [Gupta]

+ The only prime permutation of 2357 such that the concatenation of both in any order forms a prime: 23573527 ; 35272357. [Beedassy]

+ The smallest prime-digit prime that forms another prime when each digit is repeated a number of times equal to its complement: 33333335555522222222777. [Beedassy]

+ The largest distinct-prime-digit emirp made up from the complementary digits of another prime, i.e., 7583. [Loungrides]

+ The 3527th emirp (172351) and the 3527th brilliant number (135127) are anagrams of each other and also contain the four prime digits. [Gaydos]

+ The only prime-digit prime containing the four prime digits once each that has no multidigit primes in the substrings of its digits. [Gaydos]

+ The only distinct-digit Ulam prime containing all prime digits. [Gupta]

(There are 2 curios for this number that have not yet been approved by an editor.)

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