51513955 has 16 divisors (see below), whose sum is σ = 63060480. Its totient is φ = 40388832.

The previous prime is 51513949. The next prime is 51513977. The reversal of 51513955 is 55931515.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51513955 - 2⁵ = 51513923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51513955.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122736 + ... + 123154.

It is an arithmetic number, because the mean of its divisors is an integer number (3941280).

Almost surely, 2^51513955 is an apocalyptic number.

51513955 is a deficient number, since it is larger than the sum of its proper divisors (11546525).

51513955 is a wasteful number, since it uses less digits than its factorization.

51513955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858.

The product of its digits is 16875, while the sum is 34.

The square root of 51513955 is about 7177.3222722684. The cubic root of 51513955 is about 372.0845449917.

The spelling of 51513955 in words is "fifty-one million, five hundred thirteen thousand, nine hundred fifty-five".