56531331 has 16 divisors (see below), whose sum is σ = 84155520. Its totient is φ = 37505160.

The previous prime is 56531329. The next prime is 56531339. The reversal of 56531331 is 13313565.

56531331 is a `hidden beast` number, since 5 + 653 + 1 + 3 + 3 + 1 = 666.

It is not a de Polignac number, because 56531331 - 2¹ = 56531329 is a prime.

It is a super-2 number, since 2×56531331² = 6391582769263122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 56531295 and 56531304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56531339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736 + ... + 10658.

It is an arithmetic number, because the mean of its divisors is an integer number (5259720).

Almost surely, 2^56531331 is an apocalyptic number.

56531331 is a deficient number, since it is larger than the sum of its proper divisors (27624189).

56531331 is a wasteful number, since it uses less digits than its factorization.

56531331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10143 (or 10137 counting only the distinct ones).

The product of its digits is 4050, while the sum is 27.

The square root of 56531331 is about 7518.7320074598. The cubic root of 56531331 is about 383.7924293221.

Adding to 56531331 its reverse (13313565), we get a palindrome (69844896).

The spelling of 56531331 in words is "fifty-six million, five hundred thirty-one thousand, three hundred thirty-one".