315238454521 has 3 divisors (see below), whose sum is σ = 315239015983. Its totient is φ = 315237893060.

The previous prime is 315238454519. The next prime is 315238454539. The reversal of 315238454521 is 125454832513.

The square root of 315238454521 is 561461.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 254357826921 + 60880627600 = 504339^2 + 246740^2 .

It is not a de Polignac number, because 315238454521 - 2¹ = 315238454519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315238454561) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 280731 + ... + 842191.

Almost surely, 2^315238454521 is an apocalyptic number.

315238454521 is the 561461-st square number.

315238454521 is the 280731-st centered octagonal number.

It is an amenable number.

315238454521 is a deficient number, since it is larger than the sum of its proper divisors (561462).

315238454521 is an frugal number, since it uses more digits than its factorization.

315238454521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122922 (or 561461 counting only the distinct ones).

The product of its digits is 576000, while the sum is 43.

The spelling of 315238454521 in words is "three hundred fifteen billion, two hundred thirty-eight million, four hundred fifty-four thousand, five hundred twenty-one".