51255513 has 12 divisors (see below), whose sum is σ = 74492080. Its totient is φ = 33959736.

The previous prime is 51255439. The next prime is 51255517. The reversal of 51255513 is 31555215.

It is not a de Polignac number, because 51255513 - 2⁸ = 51255257 is a prime.

It is a super-2 number, since 2×51255513² = 5254255225786338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51255517) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16003 + ... + 18936.

Almost surely, 2^51255513 is an apocalyptic number.

It is an amenable number.

51255513 is a deficient number, since it is larger than the sum of its proper divisors (23236567).

51255513 is a wasteful number, since it uses less digits than its factorization.

51255513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35108 (or 35105 counting only the distinct ones).

The product of its digits is 3750, while the sum is 27.

The square root of 51255513 is about 7159.2955659059. The cubic root of 51255513 is about 371.4612605704.

The spelling of 51255513 in words is "fifty-one million, two hundred fifty-five thousand, five hundred thirteen".