208931090 has 8 divisors (see below), whose sum is σ = 376075980. Its totient is φ = 83572432.

The previous prime is 208931083. The next prime is 208931117. The reversal of 208931090 is 90139802.

It can be written as a sum of positive squares in 2 ways, for example, as 208253761 + 677329 = 14431^2 + 823^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 10446545 + ... + 10446564.

Almost surely, 2^208931090 is an apocalyptic number.

208931090 is a deficient number, since it is larger than the sum of its proper divisors (167144890).

208931090 is a wasteful number, since it uses less digits than its factorization.

208931090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20893116.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 208931090 is about 14454.4487961319. The cubic root of 208931090 is about 593.3819844661.

The spelling of 208931090 in words is "two hundred eight million, nine hundred thirty-one thousand, ninety".