316995921 has 18 divisors (see below), whose sum is σ = 503294610. Its totient is φ = 192118080.

The previous prime is 316995907. The next prime is 316995947. The reversal of 316995921 is 129599613.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 159744321 + 157251600 = 12639^2 + 12540^2 .

It is not a de Polignac number, because 316995921 - 2⁷ = 316995793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (316995971) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 144456 + ... + 146633.

Almost surely, 2^316995921 is an apocalyptic number.

It is an amenable number.

316995921 is a deficient number, since it is larger than the sum of its proper divisors (186298689).

316995921 is a wasteful number, since it uses less digits than its factorization.

316995921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291117 (or 291103 counting only the distinct ones).

The product of its digits is 131220, while the sum is 45.

The square root of 316995921 is about 17804.3792646641. The cubic root of 316995921 is about 681.8432695690.

The spelling of 316995921 in words is "three hundred sixteen million, nine hundred ninety-five thousand, nine hundred twenty-one".