51211972 has 12 divisors (see below), whose sum is σ = 102424000. Its totient is φ = 21947976.

The previous prime is 51211931. The next prime is 51211981. The reversal of 51211972 is 27911215.

51211972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

51211972 is an admirable number.

It is a super-2 number, since 2×51211972² = 5245332152257568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 1828999 = 51211972 / (5 + 1 + 2 + 1 + 1 + 9 + 7 + 2).

It is a self number, because there is not a number n which added to its sum of digits gives 51211972.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914472 + ... + 914527.

Almost surely, 2^51211972 is an apocalyptic number.

It is an amenable number.

51211972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

51211972 is a wasteful number, since it uses less digits than its factorization.

51211972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829010 (or 1829008 counting only the distinct ones).

The product of its digits is 1260, while the sum is 28.

The square root of 51211972 is about 7156.2540480338. The cubic root of 51211972 is about 371.3560466739.

The spelling of 51211972 in words is "fifty-one million, two hundred eleven thousand, nine hundred seventy-two".