316287991 has 2 divisors, whose sum is σ = 316287992. Its totient is φ = 316287990.

The previous prime is 316287943. The next prime is 316288001. The reversal of 316287991 is 199782613.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 316287991 - 2¹⁵ = 316255223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (316287901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 158143995 + 158143996.

It is an arithmetic number, because the mean of its divisors is an integer number (158143996).

Almost surely, 2^316287991 is an apocalyptic number.

316287991 is a deficient number, since it is larger than the sum of its proper divisors (1).

316287991 is an equidigital number, since it uses as much as digits as its factorization.

316287991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 316287991 is about 17784.4873696151. The cubic root of 316287991 is about 681.3353165769.

The spelling of 316287991 in words is "three hundred sixteen million, two hundred eighty-seven thousand, nine hundred ninety-one".