208490931 has 12 divisors (see below), whose sum is σ = 328531320. Its totient is φ = 126358080.

The previous prime is 208490921. The next prime is 208490957. The reversal of 208490931 is 139094802.

It is not a de Polignac number, because 208490931 - 2⁵ = 208490899 is a prime.

It is a super-2 number, since 2×208490931² = 86936936618493522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (208490921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1052886 + ... + 1053083.

It is an arithmetic number, because the mean of its divisors is an integer number (27377610).

Almost surely, 2^208490931 is an apocalyptic number.

208490931 is a deficient number, since it is larger than the sum of its proper divisors (120040389).

208490931 is a wasteful number, since it uses less digits than its factorization.

208490931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105986 (or 2105983 counting only the distinct ones).

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

The square root of 208490931 is about 14439.2150409917. The cubic root of 208490931 is about 592.9649952274.

The spelling of 208490931 in words is "two hundred eight million, four hundred ninety thousand, nine hundred thirty-one".