313315221 has 4 divisors (see below), whose sum is σ = 417753632. Its totient is φ = 208876812.

The previous prime is 313315201. The next prime is 313315229. The reversal of 313315221 is 122513313.

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 not a de Polignac number, because 313315221 - 2¹⁴ = 313298837 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 (313315229) 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, 52219201 + ... + 52219206.

It is an arithmetic number, because the mean of its divisors is an integer number (104438408).

Almost surely, 2^313315221 is an apocalyptic number.

It is an amenable number.

313315221 is a deficient number, since it is larger than the sum of its proper divisors (104438411).

313315221 is a wasteful number, since it uses less digits than its factorization.

313315221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104438410.

The product of its digits is 540, while the sum is 21.

The square root of 313315221 is about 17700.7124432888. The cubic root of 313315221 is about 679.1939851625.

Adding to 313315221 its reverse (122513313), we get a palindrome (435828534).

The spelling of 313315221 in words is "three hundred thirteen million, three hundred fifteen thousand, two hundred twenty-one".