51212564 has 24 divisors (see below), whose sum is σ = 96717768. Its totient is φ = 23587200.

The previous prime is 51212561. The next prime is 51212573. The reversal of 51212564 is 46521215.

It can be written as a sum of positive squares in 4 ways, for example, as 688900 + 50523664 = 830^2 + 7108^2 .

It is a super-2 number, since 2×51212564² = 5245453422908192, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51212561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38714 + ... + 40014.

It is an arithmetic number, because the mean of its divisors is an integer number (4029907).

Almost surely, 2^51212564 is an apocalyptic number.

It is an amenable number.

51212564 is a deficient number, since it is larger than the sum of its proper divisors (45505204).

51212564 is a wasteful number, since it uses less digits than its factorization.

51212564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2075 (or 2073 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 51212564 is about 7156.2954103363. The cubic root of 51212564 is about 371.3574776018.

Adding to 51212564 its reverse (46521215), we get a palindrome (97733779).

The spelling of 51212564 in words is "fifty-one million, two hundred twelve thousand, five hundred sixty-four".