315613421 has 4 divisors (see below), whose sum is σ = 322953312. Its totient is φ = 308273532.

The previous prime is 315613411. The next prime is 315613423. The reversal of 315613421 is 124316513.

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: 124316513 = 8161 ⋅15233.

It is a cyclic number.

It is not a de Polignac number, because 315613421 - 2²² = 311419117 is a prime.

It is a super-2 number, since 2×315613421² = 199223663030646482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315613423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3669881 + ... + 3669966.

It is an arithmetic number, because the mean of its divisors is an integer number (80738328).

Almost surely, 2^315613421 is an apocalyptic number.

It is an amenable number.

315613421 is a deficient number, since it is larger than the sum of its proper divisors (7339891).

315613421 is an equidigital number, since it uses as much as digits as its factorization.

315613421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7339890.

The product of its digits is 2160, while the sum is 26.

The square root of 315613421 is about 17765.5121232122. The cubic root of 315613421 is about 680.8505943071.

Adding to 315613421 its reverse (124316513), we get a palindrome (439929934).

The spelling of 315613421 in words is "three hundred fifteen million, six hundred thirteen thousand, four hundred twenty-one".