315267991 has 2 divisors, whose sum is σ = 315267992. Its totient is φ = 315267990.

The previous prime is 315267989. The next prime is 315268021. The reversal of 315267991 is 199762513.

It is a weak prime.

It is an emirp because it is prime and its reverse (199762513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 315267991 - 2¹ = 315267989 is a prime.

It is a super-2 number, since 2×315267991² = 198787812298352162, which contains 22 as substring.

Together with 315267989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315264991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157633995 + 157633996.

It is an arithmetic number, because the mean of its divisors is an integer number (157633996).

Almost surely, 2^315267991 is an apocalyptic number.

315267991 is a deficient number, since it is larger than the sum of its proper divisors (1).

315267991 is an equidigital number, since it uses as much as digits as its factorization.

315267991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 43.

The square root of 315267991 is about 17755.7875353362. The cubic root of 315267991 is about 680.6021130334.

The spelling of 315267991 in words is "three hundred fifteen million, two hundred sixty-seven thousand, nine hundred ninety-one".