316387921 has 2 divisors, whose sum is σ = 316387922. Its totient is φ = 316387920.

The previous prime is 316387889. The next prime is 316387957. The reversal of 316387921 is 129783613.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263607696 + 52780225 = 16236^2 + 7265^2 .

It is a cyclic number.

It is not a de Polignac number, because 316387921 - 2⁵ = 316387889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (316387991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158193960 + 158193961.

It is an arithmetic number, because the mean of its divisors is an integer number (158193961).

Almost surely, 2^316387921 is an apocalyptic number.

It is an amenable number.

316387921 is a deficient number, since it is larger than the sum of its proper divisors (1).

316387921 is an equidigital number, since it uses as much as digits as its factorization.

316387921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 316387921 is about 17787.2966186546. The cubic root of 316387921 is about 681.4070641307.

The spelling of 316387921 in words is "three hundred sixteen million, three hundred eighty-seven thousand, nine hundred twenty-one".