231661056 has 80 divisors (see below), whose sum is σ = 673314048. Its totient is φ = 70195200.

The previous prime is 231661049. The next prime is 231661063. The reversal of 231661056 is 650166132.

231661056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (231661049) and next prime (231661063).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10041 + ... + 23751.

Almost surely, 2^231661056 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 231661056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336657024).

231661056 is an abundant number, since it is smaller than the sum of its proper divisors (441652992).

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

231661056 is a wasteful number, since it uses less digits than its factorization.

231661056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13743 (or 13727 counting only the distinct ones).

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

The square root of 231661056 is about 15220.4157630467. The cubic root of 231661056 is about 614.1639826980.

The spelling of 231661056 in words is "two hundred thirty-one million, six hundred sixty-one thousand, fifty-six".