315215371 has 4 divisors (see below), whose sum is σ = 318465112. Its totient is φ = 311965632.

The previous prime is 315215359. The next prime is 315215393. The reversal of 315215371 is 173512513.

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 315215371 - 2⁹ = 315214859 is a prime.

It is a super-2 number, since 2×315215371² = 198721460229335282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315216371) 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, 1624725 + ... + 1624918.

It is an arithmetic number, because the mean of its divisors is an integer number (79616278).

Almost surely, 2^315215371 is an apocalyptic number.

315215371 is a deficient number, since it is larger than the sum of its proper divisors (3249741).

315215371 is an equidigital number, since it uses as much as digits as its factorization.

315215371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3249740.

The product of its digits is 3150, while the sum is 28.

The square root of 315215371 is about 17754.3057031245. The cubic root of 315215371 is about 680.5642454870.

Adding to 315215371 its reverse (173512513), we get a palindrome (488727884).

The spelling of 315215371 in words is "three hundred fifteen million, two hundred fifteen thousand, three hundred seventy-one".