317221990 has 8 divisors (see below), whose sum is σ = 570999600. Its totient is φ = 126888792.

The previous prime is 317221987. The next prime is 317222027. The reversal of 317221990 is 99122713.

It is a happy number.

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

It is a congruent number.

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, 15861090 + ... + 15861109.

It is an arithmetic number, because the mean of its divisors is an integer number (71374950).

Almost surely, 2^317221990 is an apocalyptic number.

317221990 is a deficient number, since it is larger than the sum of its proper divisors (253777610).

317221990 is a wasteful number, since it uses less digits than its factorization.

317221990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31722206.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 317221990 is about 17810.7268240238. The cubic root of 317221990 is about 682.0053189702.

The spelling of 317221990 in words is "three hundred seventeen million, two hundred twenty-one thousand, nine hundred ninety".