315047521 has 4 divisors (see below), whose sum is σ = 315311044. Its totient is φ = 314784000.

The previous prime is 315047507. The next prime is 315047539. The reversal of 315047521 is 125740513.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 96746896 + 218300625 = 9836^2 + 14775^2 .

It is a cyclic number.

It is not a de Polignac number, because 315047521 - 2¹⁹ = 314523233 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 315047521.

It is not an unprimeable number, because it can be changed into a prime (315047591) 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, 129960 + ... + 132361.

It is an arithmetic number, because the mean of its divisors is an integer number (78827761).

Almost surely, 2^315047521 is an apocalyptic number.

It is an amenable number.

315047521 is a deficient number, since it is larger than the sum of its proper divisors (263523).

315047521 is a wasteful number, since it uses less digits than its factorization.

315047521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263522.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 315047521 is about 17749.5780513228. The cubic root of 315047521 is about 680.4434254581.

The spelling of 315047521 in words is "three hundred fifteen million, forty-seven thousand, five hundred twenty-one".