231581952 has 216 divisors, whose sum is σ = 776752704. Its totient is φ = 64991232.

The previous prime is 231581921. The next prime is 231581969. The reversal of 231581952 is 259185132.

231581952 is a `hidden beast` number, since 23 + 1 + 581 + 9 + 52 = 666.

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

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, 1338538 + ... + 1338710.

Almost surely, 2^231581952 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 231581952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388376352).

231581952 is an abundant number, since it is smaller than the sum of its proper divisors (545170752).

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

231581952 is a wasteful number, since it uses less digits than its factorization.

231581952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 268 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 231581952 is about 15217.8169262217. The cubic root of 231581952 is about 614.0940696976.

The spelling of 231581952 in words is "two hundred thirty-one million, five hundred eighty-one thousand, nine hundred fifty-two".