56631509 has 6 divisors (see below), whose sum is σ = 62247990. Its totient is φ = 51483080.

The previous prime is 56631503. The next prime is 56631511. The reversal of 56631509 is 90513665.

It can be written as a sum of positive squares in only one way, i.e., 43850884 + 12780625 = 6622^2 + 3575^2 .

It is not a de Polignac number, because 56631509 - 2¹² = 56627413 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 (56631503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 233894 + ... + 234135.

It is an arithmetic number, because the mean of its divisors is an integer number (10374665).

Almost surely, 2^56631509 is an apocalyptic number.

It is an amenable number.

56631509 is a deficient number, since it is larger than the sum of its proper divisors (5616481).

56631509 is a wasteful number, since it uses less digits than its factorization.

56631509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468051 (or 468040 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 56631509 is about 7525.3909532994. The cubic root of 56631509 is about 384.0189990781.

The spelling of 56631509 in words is "fifty-six million, six hundred thirty-one thousand, five hundred nine".