51997056 has 32 divisors (see below), whose sum is σ = 138118200. Its totient is φ = 17332224.

The previous prime is 51997039. The next prime is 51997069. The reversal of 51997056 is 65079915.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 51996999 and 51997017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67321 + ... + 68088.

Almost surely, 2^51997056 is an apocalyptic number.

It is an amenable number.

51997056 is an abundant number, since it is smaller than the sum of its proper divisors (86121144).

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

51997056 is a wasteful number, since it uses less digits than its factorization.

51997056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135426 (or 135414 counting only the distinct ones).

The product of its (nonzero) digits is 85050, while the sum is 42.

The square root of 51997056 is about 7210.8984183665. The cubic root of 51997056 is about 373.2440716303.

The spelling of 51997056 in words is "fifty-one million, nine hundred ninety-seven thousand, fifty-six".