315617421 has 16 divisors (see below), whose sum is σ = 482070528. Its totient is φ = 179929200.

The previous prime is 315617381. The next prime is 315617447. The reversal of 315617421 is 124716513.

It is not a de Polignac number, because 315617421 - 2¹⁵ = 315584653 is a prime.

It is a super-2 number, since 2×315617421² = 199228712877382482, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315617521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8385 + ... + 26486.

It is an arithmetic number, because the mean of its divisors is an integer number (30129408).

Almost surely, 2^315617421 is an apocalyptic number.

It is an amenable number.

315617421 is a deficient number, since it is larger than the sum of its proper divisors (166453107).

315617421 is a wasteful number, since it uses less digits than its factorization.

315617421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35312.

The product of its digits is 5040, while the sum is 30.

The square root of 315617421 is about 17765.6247005277. The cubic root of 315617421 is about 680.8534706010.

The spelling of 315617421 in words is "three hundred fifteen million, six hundred seventeen thousand, four hundred twenty-one".