231211992 has 32 divisors (see below), whose sum is σ = 630578880. Its totient is φ = 70064160.

The previous prime is 231211961. The next prime is 231212057. The reversal of 231211992 is 299112132.

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, 437638 + ... + 438165.

It is an arithmetic number, because the mean of its divisors is an integer number (19705590).

Almost surely, 2^231211992 is an apocalyptic number.

231211992 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

231211992 is an abundant number, since it is smaller than the sum of its proper divisors (399366888).

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

231211992 is a wasteful number, since it uses less digits than its factorization.

231211992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875823 (or 875819 counting only the distinct ones).

The product of its digits is 1944, while the sum is 30.

The square root of 231211992 is about 15205.6565790498. The cubic root of 231211992 is about 613.7668833906.

The spelling of 231211992 in words is "two hundred thirty-one million, two hundred eleven thousand, nine hundred ninety-two".