51331564 has 12 divisors (see below), whose sum is σ = 90516888. Its totient is φ = 25469600.

The previous prime is 51331513. The next prime is 51331573. The reversal of 51331564 is 46513315.

51331564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 48457 + ... + 49504.

It is an arithmetic number, because the mean of its divisors is an integer number (7543074).

Almost surely, 2^51331564 is an apocalyptic number.

It is an amenable number.

51331564 is a deficient number, since it is larger than the sum of its proper divisors (39185324).

51331564 is a wasteful number, since it uses less digits than its factorization.

51331564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98096 (or 98094 counting only the distinct ones).

The product of its digits is 5400, while the sum is 28.

The square root of 51331564 is about 7164.6049437495. The cubic root of 51331564 is about 371.6448898562.

Adding to 51331564 its reverse (46513315), we get a palindrome (97844879).

The spelling of 51331564 in words is "fifty-one million, three hundred thirty-one thousand, five hundred sixty-four".