51172866 has 12 divisors (see below), whose sum is σ = 110874582. Its totient is φ = 17057616.

The previous prime is 51172829. The next prime is 51172897. The reversal of 51172866 is 66827115.

It can be written as a sum of positive squares in only one way, i.e., 39125025 + 12047841 = 6255^2 + 3471^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51172866.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1421451 + ... + 1421486.

Almost surely, 2^51172866 is an apocalyptic number.

51172866 is an abundant number, since it is smaller than the sum of its proper divisors (59701716).

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

51172866 is a wasteful number, since it uses less digits than its factorization.

51172866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2842945 (or 2842942 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 51172866 is about 7153.5212308345. The cubic root of 51172866 is about 371.2614988106.

The spelling of 51172866 in words is "fifty-one million, one hundred seventy-two thousand, eight hundred sixty-six".