315252521 has 4 divisors (see below), whose sum is σ = 315408132. Its totient is φ = 315096912.

The previous prime is 315252499. The next prime is 315252551. The reversal of 315252521 is 125252513.

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 255360400 + 59892121 = 15980^2 + 7739^2 .

It is a cyclic number.

It is not a de Polignac number, because 315252521 - 2²⁶ = 248143657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315252551) 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, 74726 + ... + 78831.

It is an arithmetic number, because the mean of its divisors is an integer number (78852033).

Almost surely, 2^315252521 is an apocalyptic number.

It is an amenable number.

315252521 is a deficient number, since it is larger than the sum of its proper divisors (155611).

315252521 is a wasteful number, since it uses less digits than its factorization.

315252521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155610.

The product of its digits is 3000, while the sum is 26.

The square root of 315252521 is about 17755.3518973858. The cubic root of 315252521 is about 680.5909806135.

The spelling of 315252521 in words is "three hundred fifteen million, two hundred fifty-two thousand, five hundred twenty-one".