316387991 has 2 divisors, whose sum is σ = 316387992. Its totient is φ = 316387990.

The previous prime is 316387957. The next prime is 316387993. The reversal of 316387991 is 199783613.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-316387991 is a prime.

Together with 316387993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316387993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158193995 + 158193996.

It is an arithmetic number, because the mean of its divisors is an integer number (158193996).

Almost surely, 2^316387991 is an apocalyptic number.

316387991 is a deficient number, since it is larger than the sum of its proper divisors (1).

316387991 is an equidigital number, since it uses as much as digits as its factorization.

316387991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 47.

The square root of 316387991 is about 17787.2985863509. The cubic root of 316387991 is about 681.4071143839.

The spelling of 316387991 in words is "three hundred sixteen million, three hundred eighty-seven thousand, nine hundred ninety-one".