315442321 has 4 divisors (see below), whose sum is σ = 315489600. Its totient is φ = 315395044.

The previous prime is 315442307. The next prime is 315442331. The reversal of 315442321 is 123244513.

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.

It is a cyclic number.

It is not a de Polignac number, because 315442321 - 2¹³ = 315434129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (315442301) 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, 11581 + ... + 27658.

It is an arithmetic number, because the mean of its divisors is an integer number (78872400).

Almost surely, 2^315442321 is an apocalyptic number.

It is an amenable number.

315442321 is a deficient number, since it is larger than the sum of its proper divisors (47279).

315442321 is an equidigital number, since it uses as much as digits as its factorization.

315442321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47278.

The product of its digits is 2880, while the sum is 25.

The square root of 315442321 is about 17760.6959604628. The cubic root of 315442321 is about 680.7275380761.

Adding to 315442321 its reverse (123244513), we get a palindrome (438686834).

The spelling of 315442321 in words is "three hundred fifteen million, four hundred forty-two thousand, three hundred twenty-one".