51564501 has 24 divisors (see below), whose sum is σ = 77242880. Its totient is φ = 33112800.

The previous prime is 51564481. The next prime is 51564503. The reversal of 51564501 is 10546515.

It is a happy number.

51564501 is a `hidden beast` number, since 5 + 15 + 645 + 0 + 1 = 666.

It is not a de Polignac number, because 51564501 - 2⁶ = 51564437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51564503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 117240 + ... + 117678.

Almost surely, 2^51564501 is an apocalyptic number.

It is an amenable number.

51564501 is a deficient number, since it is larger than the sum of its proper divisors (25678379).

51564501 is a wasteful number, since it uses less digits than its factorization.

51564501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 51564501 is about 7180.8426385766. The cubic root of 51564501 is about 372.2062028831.

The spelling of 51564501 in words is "fifty-one million, five hundred sixty-four thousand, five hundred one".