231091668 has 72 divisors (see below), whose sum is σ = 606627840. Its totient is φ = 74122560.

The previous prime is 231091657. The next prime is 231091687. The reversal of 231091668 is 866190132.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 102093 + ... + 104331.

Almost surely, 2^231091668 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 231091668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303313920).

231091668 is an abundant number, since it is smaller than the sum of its proper divisors (375536172).

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

231091668 is a wasteful number, since it uses less digits than its factorization.

231091668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357 (or 2352 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 231091668 is about 15201.6995102521. The cubic root of 231091668 is about 613.6603956888.

The spelling of 231091668 in words is "two hundred thirty-one million, ninety-one thousand, six hundred sixty-eight".