231771864 has 16 divisors (see below), whose sum is σ = 579429720. Its totient is φ = 77257280.

The previous prime is 231771847. The next prime is 231771887. The reversal of 231771864 is 468177132.

231771864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4828557 + ... + 4828604.

Almost surely, 2^231771864 is an apocalyptic number.

231771864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

231771864 is an abundant number, since it is smaller than the sum of its proper divisors (347657856).

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

231771864 is a wasteful number, since it uses less digits than its factorization.

231771864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9657170 (or 9657166 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 231771864 is about 15224.0554386799. The cubic root of 231771864 is about 614.2618892920.

The spelling of 231771864 in words is "two hundred thirty-one million, seven hundred seventy-one thousand, eight hundred sixty-four".