315565279 has 2 divisors, whose sum is σ = 315565280. Its totient is φ = 315565278.

The previous prime is 315565277. The next prime is 315565297. The reversal of 315565279 is 972565513.

Together with next prime (315565297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 315565279 - 2¹ = 315565277 is a prime.

It is a super-3 number, since 3×315565279³ (a number of 26 digits) contains 333 as substring.

Together with 315565277, 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 (315565273) 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, 157782639 + 157782640.

It is an arithmetic number, because the mean of its divisors is an integer number (157782640).

Almost surely, 2^315565279 is an apocalyptic number.

315565279 is a deficient number, since it is larger than the sum of its proper divisors (1).

315565279 is an equidigital number, since it uses as much as digits as its factorization.

315565279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 283500, while the sum is 43.

The square root of 315565279 is about 17764.1571429663. The cubic root of 315565279 is about 680.8159747653.

It can be divided in two parts, 315565 and 279, that added together give a square (315844 = 562²).

The spelling of 315565279 in words is "three hundred fifteen million, five hundred sixty-five thousand, two hundred seventy-nine".