51121564 has 24 divisors (see below), whose sum is σ = 97115648. Its totient is φ = 23405760.

The previous prime is 51121561. The next prime is 51121579. The reversal of 51121564 is 46512115.

It is a happy number.

It is a super-2 number, since 2×51121564² = 5226828611612192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121561) 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, 2734 + ... + 10474.

Almost surely, 2^51121564 is an apocalyptic number.

It is an amenable number.

51121564 is a deficient number, since it is larger than the sum of its proper divisors (45994084).

51121564 is a wasteful number, since it uses less digits than its factorization.

51121564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7885 (or 7883 counting only the distinct ones).

The product of its digits is 1200, while the sum is 25.

The square root of 51121564 is about 7149.9345451549. The cubic root of 51121564 is about 371.1373912038.

Adding to 51121564 its reverse (46512115), we get a palindrome (97633679).

The spelling of 51121564 in words is "fifty-one million, one hundred twenty-one thousand, five hundred sixty-four".