51731564 has 6 divisors (see below), whose sum is σ = 90530244. Its totient is φ = 25865780.

The previous prime is 51731549. The next prime is 51731569. The reversal of 51731564 is 46513715.

51731564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 51731564.

It is not an unprimeable number, because it can be changed into a prime (51731569) by changing a digit.

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 as a sum of consecutive naturals, namely, 6466442 + ... + 6466449.

It is an arithmetic number, because the mean of its divisors is an integer number (15088374).

Almost surely, 2^51731564 is an apocalyptic number.

It is an amenable number.

51731564 is a deficient number, since it is larger than the sum of its proper divisors (38798680).

51731564 is a wasteful number, since it uses less digits than its factorization.

51731564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12932895 (or 12932893 counting only the distinct ones).

The product of its digits is 12600, while the sum is 32.

The square root of 51731564 is about 7192.4657802453. The cubic root of 51731564 is about 372.6077378555.

The spelling of 51731564 in words is "fifty-one million, seven hundred thirty-one thousand, five hundred sixty-four".