231090208 has 12 divisors (see below), whose sum is σ = 454958910. Its totient is φ = 115545088.

The previous prime is 231090173. The next prime is 231090221. The reversal of 231090208 is 802090132.

It can be written as a sum of positive squares in only one way, i.e., 118984464 + 112105744 = 10908^2 + 10588^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610753 + ... + 3610816.

Almost surely, 2^231090208 is an apocalyptic number.

It is an amenable number.

231090208 is a deficient number, since it is larger than the sum of its proper divisors (223868702).

231090208 is an equidigital number, since it uses as much as digits as its factorization.

231090208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7221579 (or 7221571 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 231090208 is about 15201.6514892297. The cubic root of 231090208 is about 613.6591033502.

The spelling of 231090208 in words is "two hundred thirty-one million, ninety thousand, two hundred eight".