56611531 has 8 divisors (see below), whose sum is σ = 57494304. Its totient is φ = 55735680.

The previous prime is 56611493. The next prime is 56611543. The reversal of 56611531 is 13511665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56611531 is a prime.

It is a super-2 number, since 2×56611531² = 6409730884327922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56611531.

It is not an unprimeable number, because it can be changed into a prime (56611231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16146 + ... + 19336.

It is an arithmetic number, because the mean of its divisors is an integer number (7186788).

Almost surely, 2^56611531 is an apocalyptic number.

56611531 is a deficient number, since it is larger than the sum of its proper divisors (882773).

56611531 is a wasteful number, since it uses less digits than its factorization.

56611531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3461.

The product of its digits is 2700, while the sum is 28.

The square root of 56611531 is about 7524.0634633156. The cubic root of 56611531 is about 383.9738367410.

The spelling of 56611531 in words is "fifty-six million, six hundred eleven thousand, five hundred thirty-one".