315142521 has 4 divisors (see below), whose sum is σ = 420190032. Its totient is φ = 210095012.

The previous prime is 315142483. The next prime is 315142543. The reversal of 315142521 is 125241513.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 315142521 - 2¹⁴ = 315126137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 315142491 and 315142500.

It is not an unprimeable number, because it can be changed into a prime (315142921) 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, 52523751 + ... + 52523756.

It is an arithmetic number, because the mean of its divisors is an integer number (105047508).

Almost surely, 2^315142521 is an apocalyptic number.

It is an amenable number.

315142521 is a deficient number, since it is larger than the sum of its proper divisors (105047511).

315142521 is a wasteful number, since it uses less digits than its factorization.

315142521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105047510.

The product of its digits is 1200, while the sum is 24.

The square root of 315142521 is about 17752.2539695668. The cubic root of 315142521 is about 680.5118126323.

The spelling of 315142521 in words is "three hundred fifteen million, one hundred forty-two thousand, five hundred twenty-one".