231091968 has 72 divisors (see below), whose sum is σ = 618105600. Its totient is φ = 76647424.

The previous prime is 231091961. The next prime is 231091979. The reversal of 231091968 is 869190132.

231091968 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×231091968² = 106806995348226048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231091961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182923 + ... + 184181.

It is an arithmetic number, because the mean of its divisors is an integer number (8584800).

Almost surely, 2^231091968 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 231091968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309052800).

231091968 is an abundant number, since it is smaller than the sum of its proper divisors (387013632).

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

231091968 is a wasteful number, since it uses less digits than its factorization.

231091968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517 (or 1503 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 231091968 is about 15201.7093775667. The cubic root of 231091968 is about 613.6606612372.

The spelling of 231091968 in words is "two hundred thirty-one million, ninety-one thousand, nine hundred sixty-eight".