315640279 has 2 divisors, whose sum is σ = 315640280. Its totient is φ = 315640278.

The previous prime is 315640277. The next prime is 315640363. The reversal of 315640279 is 972046513.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 315640279 - 2¹ = 315640277 is a prime.

Together with 315640277, 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 (315640277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157820139 + 157820140.

It is an arithmetic number, because the mean of its divisors is an integer number (157820140).

Almost surely, 2^315640279 is an apocalyptic number.

315640279 is a deficient number, since it is larger than the sum of its proper divisors (1).

315640279 is an equidigital number, since it uses as much as digits as its factorization.

315640279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 315640279 is about 17766.2680099114. The cubic root of 315640279 is about 680.8699067163.

The spelling of 315640279 in words is "three hundred fifteen million, six hundred forty thousand, two hundred seventy-nine".