231455556 has 72 divisors (see below), whose sum is σ = 609991200. Its totient is φ = 76738752.

The previous prime is 231455513. The next prime is 231455563. The reversal of 231455556 is 655554132.

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

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 231455556.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220120 + ... + 221168.

It is an arithmetic number, because the mean of its divisors is an integer number (8472100).

Almost surely, 2^231455556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231455556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304995600).

231455556 is an abundant number, since it is smaller than the sum of its proper divisors (378535644).

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

231455556 is a wasteful number, since it uses less digits than its factorization.

231455556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295 (or 1281 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The square root of 231455556 is about 15213.6634641364. The cubic root of 231455556 is about 613.9823264479.

The spelling of 231455556 in words is "two hundred thirty-one million, four hundred fifty-five thousand, five hundred fifty-six".