231811983 has 64 divisors (see below), whose sum is σ = 399530880. Its totient is φ = 131549184.

The previous prime is 231811973. The next prime is 231811997. The reversal of 231811983 is 389118132.

It is not a de Polignac number, because 231811983 - 2²⁵ = 198257551 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231811973) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 315885 + ... + 316617.

It is an arithmetic number, because the mean of its divisors is an integer number (6242670).

Almost surely, 2^231811983 is an apocalyptic number.

231811983 is a deficient number, since it is larger than the sum of its proper divisors (167718897).

231811983 is a wasteful number, since it uses less digits than its factorization.

231811983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 825 (or 819 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 231811983 is about 15225.3730003570. The cubic root of 231811983 is about 614.2973295313.

The spelling of 231811983 in words is "two hundred thirty-one million, eight hundred eleven thousand, nine hundred eighty-three".