231553656 has 24 divisors (see below), whose sum is σ = 627124680. Its totient is φ = 77184528.

The previous prime is 231553643. The next prime is 231553657. The reversal of 231553656 is 656355132.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 231553656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231553657) 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, 1607940 + ... + 1608083.

It is an arithmetic number, because the mean of its divisors is an integer number (26130195).

Almost surely, 2^231553656 is an apocalyptic number.

It is an amenable number.

231553656 is an abundant number, since it is smaller than the sum of its proper divisors (395571024).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231553656 is a wasteful number, since it uses less digits than its factorization.

231553656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3216035 (or 3216028 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 231553656 is about 15216.8871981099. The cubic root of 231553656 is about 614.0690575101.

The spelling of 231553656 in words is "two hundred thirty-one million, five hundred fifty-three thousand, six hundred fifty-six".