231875991 has 6 divisors (see below), whose sum is σ = 334932000. Its totient is φ = 154583988.

The previous prime is 231875983. The next prime is 231876013. The reversal of 231875991 is 199578132.

It is not a de Polignac number, because 231875991 - 2³ = 231875983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231875911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12881991 + ... + 12882008.

It is an arithmetic number, because the mean of its divisors is an integer number (55822000).

Almost surely, 2^231875991 is an apocalyptic number.

231875991 is a deficient number, since it is larger than the sum of its proper divisors (103056009).

231875991 is a wasteful number, since it uses less digits than its factorization.

231875991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25764005 (or 25764002 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 231875991 is about 15227.4748727424. The cubic root of 231875991 is about 614.3538643209.

The spelling of 231875991 in words is "two hundred thirty-one million, eight hundred seventy-five thousand, nine hundred ninety-one".