61

This number is a prime.

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61 is the sum of two consecutive squares: 5² + 6². [Schlesinger]

The smallest prime integer quotient of a 4-digit Harshad number, i.e., 61 = 1098/(1+0+9+8). [Brueggeman]

The first Self-Belgian number of type 2. [Angelini]

The M61 Vulcan is a hydraulically, electrically, or pneumatically driven, six-barrel, air-cooled, electrically fired Gatling-style rotary cannon. [GE]