51915656 has 16 divisors (see below), whose sum is σ = 104829900. Its totient is φ = 23961024.

The previous prime is 51915641. The next prime is 51915659. The reversal of 51915656 is 65651915.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 49140100 + 2775556 = 7010^2 + 1666^2 .

It is not an unprimeable number, because it can be changed into a prime (51915659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249491 + ... + 249698.

Almost surely, 2^51915656 is an apocalyptic number.

It is an amenable number.

51915656 is an abundant number, since it is smaller than the sum of its proper divisors (52914244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51915656 is a wasteful number, since it uses less digits than its factorization.

51915656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499208 (or 499204 counting only the distinct ones).

The product of its digits is 40500, while the sum is 38.

The square root of 51915656 is about 7205.2519733872. The cubic root of 51915656 is about 373.0492020378.

The spelling of 51915656 in words is "fifty-one million, nine hundred fifteen thousand, six hundred fifty-six".