208931949 has 12 divisors (see below), whose sum is σ = 301915900. Its totient is φ = 139230144.

The previous prime is 208931903. The next prime is 208931951. The reversal of 208931949 is 949139802.

It can be written as a sum of positive squares in 2 ways, for example, as 110565225 + 98366724 = 10515^2 + 9918^2 .

It is not a de Polignac number, because 208931949 - 2⁸ = 208931693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208931549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40107 + ... + 45015.

Almost surely, 2^208931949 is an apocalyptic number.

It is an amenable number.

208931949 is a deficient number, since it is larger than the sum of its proper divisors (92983951).

208931949 is a wasteful number, since it uses less digits than its factorization.

208931949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9644 (or 9641 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 208931949 is about 14454.4785101366. The cubic root of 208931949 is about 593.3827976759.

The spelling of 208931949 in words is "two hundred eight million, nine hundred thirty-one thousand, nine hundred forty-nine".