51521164 has 6 divisors (see below), whose sum is σ = 90162044. Its totient is φ = 25760580.

The previous prime is 51521161. The next prime is 51521177. The reversal of 51521164 is 46112515.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51521161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6440142 + ... + 6440149.

Almost surely, 2^51521164 is an apocalyptic number.

It is an amenable number.

51521164 is a deficient number, since it is larger than the sum of its proper divisors (38640880).

51521164 is a wasteful number, since it uses less digits than its factorization.

51521164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12880295 (or 12880293 counting only the distinct ones).

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

The square root of 51521164 is about 7177.8244614925. The cubic root of 51521164 is about 372.1019010160.

Adding to 51521164 its reverse (46112515), we get a palindrome (97633679).

The spelling of 51521164 in words is "fifty-one million, five hundred twenty-one thousand, one hundred sixty-four".