231397056 has 168 divisors, whose sum is σ = 737006400. Its totient is φ = 68820480.

The previous prime is 231397031. The next prime is 231397069. The reversal of 231397056 is 650793132.

231397056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 231397056.

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, 373515 + ... + 374133.

Almost surely, 2^231397056 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 231397056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368503200).

231397056 is an abundant number, since it is smaller than the sum of its proper divisors (505609344).

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

231397056 is a wasteful number, since it uses less digits than its factorization.

231397056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707 (or 694 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 231397056 is about 15211.7407287923. The cubic root of 231397056 is about 613.9305944247.

The spelling of 231397056 in words is "two hundred thirty-one million, three hundred ninety-seven thousand, fifty-six".