56231661 has 8 divisors (see below), whose sum is σ = 76246560. Its totient is φ = 36852272.

The previous prime is 56231641. The next prime is 56231671. The reversal of 56231661 is 16613265.

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

It is a cyclic number.

It is not a de Polignac number, because 56231661 - 2¹⁰ = 56230637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56231611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158670 + ... + 159023.

It is an arithmetic number, because the mean of its divisors is an integer number (9530820).

Almost surely, 2^56231661 is an apocalyptic number.

It is an amenable number.

56231661 is a deficient number, since it is larger than the sum of its proper divisors (20014899).

56231661 is a wasteful number, since it uses less digits than its factorization.

56231661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317755.

The product of its digits is 6480, while the sum is 30.

The square root of 56231661 is about 7498.7773003337. Note that the first 3 decimals coincide. The cubic root of 56231661 is about 383.1130721191.

It can be divided in two parts, 562 and 31661, that added together give a palindrome (32223).

The spelling of 56231661 in words is "fifty-six million, two hundred thirty-one thousand, six hundred sixty-one".