51717812 has 6 divisors (see below), whose sum is σ = 90506178. Its totient is φ = 25858904.

The previous prime is 51717793. The next prime is 51717821. The reversal of 51717812 is 21871715.

It can be written as a sum of positive squares in only one way, i.e., 26275876 + 25441936 = 5126^2 + 5044^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6464723 + ... + 6464730.

It is an arithmetic number, because the mean of its divisors is an integer number (15084363).

Almost surely, 2^51717812 is an apocalyptic number.

It is an amenable number.

51717812 is a deficient number, since it is larger than the sum of its proper divisors (38788366).

51717812 is a wasteful number, since it uses less digits than its factorization.

51717812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12929457 (or 12929455 counting only the distinct ones).

The product of its digits is 3920, while the sum is 32.

The square root of 51717812 is about 7191.5097163252. The cubic root of 51717812 is about 372.5747176815.

The spelling of 51717812 in words is "fifty-one million, seven hundred seventeen thousand, eight hundred twelve".