315532391 has 2 divisors, whose sum is σ = 315532392. Its totient is φ = 315532390.

The previous prime is 315532387. The next prime is 315532421. The reversal of 315532391 is 193235513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 315532391 - 2² = 315532387 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (315532361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157766195 + 157766196.

It is an arithmetic number, because the mean of its divisors is an integer number (157766196).

Almost surely, 2^315532391 is an apocalyptic number.

315532391 is a deficient number, since it is larger than the sum of its proper divisors (1).

315532391 is an equidigital number, since it uses as much as digits as its factorization.

315532391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12150, while the sum is 32.

The square root of 315532391 is about 17763.2314346236. The cubic root of 315532391 is about 680.7923225501.

The spelling of 315532391 in words is "three hundred fifteen million, five hundred thirty-two thousand, three hundred ninety-one".