51900916 has 12 divisors (see below), whose sum is σ = 93042180. Its totient is φ = 25317440.

The previous prime is 51900907. The next prime is 51900931. The reversal of 51900916 is 61900915.

It can be written as a sum of positive squares in 2 ways, for example, as 29376400 + 22524516 = 5420^2 + 4746^2 .

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, 158071 + ... + 158398.

It is an arithmetic number, because the mean of its divisors is an integer number (7753515).

Almost surely, 2^51900916 is an apocalyptic number.

It is an amenable number.

51900916 is a deficient number, since it is larger than the sum of its proper divisors (41141264).

51900916 is a wasteful number, since it uses less digits than its factorization.

51900916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316514 (or 316512 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 51900916 is about 7204.2290357817. The cubic root of 51900916 is about 373.0138930633.

Subtracting 51900916 from its reverse (61900915), we obtain a palindrome (9999999).

The spelling of 51900916 in words is "fifty-one million, nine hundred thousand, nine hundred sixteen".