51172056 has 96 divisors (see below), whose sum is σ = 155806560. Its totient is φ = 15054336.

The previous prime is 51172019. The next prime is 51172061. The reversal of 51172056 is 65027115.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20340 + ... + 22716.

It is an arithmetic number, because the mean of its divisors is an integer number (1622985).

Almost surely, 2^51172056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51172056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77903280).

51172056 is an abundant number, since it is smaller than the sum of its proper divisors (104634504).

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

51172056 is a wasteful number, since it uses less digits than its factorization.

51172056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425 (or 2418 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 51172056 is about 7153.4646151358. The cubic root of 51172056 is about 371.2595399378.

The spelling of 51172056 in words is "fifty-one million, one hundred seventy-two thousand, fifty-six".