315240215 has 4 divisors (see below), whose sum is σ = 378288264. Its totient is φ = 252192168.

The previous prime is 315240199. The next prime is 315240221. The reversal of 315240215 is 512042513.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 315240215 - 2⁴ = 315240199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31524017 + ... + 31524026.

It is an arithmetic number, because the mean of its divisors is an integer number (94572066).

Almost surely, 2^315240215 is an apocalyptic number.

315240215 is a deficient number, since it is larger than the sum of its proper divisors (63048049).

315240215 is an equidigital number, since it uses as much as digits as its factorization.

315240215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63048048.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 315240215 is about 17755.0053506047. The cubic root of 315240215 is about 680.5821247905.

Adding to 315240215 its reverse (512042513), we get a palindrome (827282728).

The spelling of 315240215 in words is "three hundred fifteen million, two hundred forty thousand, two hundred fifteen".