315131515 has 4 divisors (see below), whose sum is σ = 378157824. Its totient is φ = 252105208.

The previous prime is 315131513. The next prime is 315131521. The reversal of 315131515 is 515131513.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515131513 = 13 ⋅39625501.

It is a cyclic number.

It is not a de Polignac number, because 315131515 - 2¹ = 315131513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 315131515.

It is not an unprimeable number, because it can be changed into a prime (315131513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31513147 + ... + 31513156.

It is an arithmetic number, because the mean of its divisors is an integer number (94539456).

Almost surely, 2^315131515 is an apocalyptic number.

315131515 is a deficient number, since it is larger than the sum of its proper divisors (63026309).

315131515 is an equidigital number, since it uses as much as digits as its factorization.

315131515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63026308.

The product of its digits is 1125, while the sum is 25.

The square root of 315131515 is about 17751.9439780549. The cubic root of 315131515 is about 680.5038905021.

The spelling of 315131515 in words is "three hundred fifteen million, one hundred thirty-one thousand, five hundred fifteen".