315725389 has 4 divisors (see below), whose sum is σ = 360829024. Its totient is φ = 270621756.

The previous prime is 315725387. The next prime is 315725401. The reversal of 315725389 is 983527513.

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, and also an emirpimes, since its reverse is a distinct semiprime: 983527513 = 683 ⋅1440011.

It is a cyclic number.

It is not a de Polignac number, because 315725389 - 2¹ = 315725387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315725381) 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, 22551807 + ... + 22551820.

It is an arithmetic number, because the mean of its divisors is an integer number (90207256).

Almost surely, 2^315725389 is an apocalyptic number.

It is an amenable number.

315725389 is a deficient number, since it is larger than the sum of its proper divisors (45103635).

315725389 is an equidigital number, since it uses as much as digits as its factorization.

315725389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45103634.

The product of its digits is 226800, while the sum is 43.

The square root of 315725389 is about 17768.6631179726. The cubic root of 315725389 is about 680.9310983469.

The spelling of 315725389 in words is "three hundred fifteen million, seven hundred twenty-five thousand, three hundred eighty-nine".