313133221 has 4 divisors (see below), whose sum is σ = 313840512. Its totient is φ = 312425932.

The previous prime is 313133209. The next prime is 313133297. The reversal of 313133221 is 122331313.

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 313133221 - 2⁵ = 313133189 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 (313133321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352981 + ... + 353866.

It is an arithmetic number, because the mean of its divisors is an integer number (78460128).

Almost surely, 2^313133221 is an apocalyptic number.

It is an amenable number.

313133221 is a deficient number, since it is larger than the sum of its proper divisors (707291).

313133221 is an equidigital number, since it uses as much as digits as its factorization.

313133221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707290.

The product of its digits is 324, while the sum is 19.

The square root of 313133221 is about 17695.5706604789. The cubic root of 313133221 is about 679.0624485717.

Adding to 313133221 its reverse (122331313), we get a palindrome (435464534).

The spelling of 313133221 in words is "three hundred thirteen million, one hundred thirty-three thousand, two hundred twenty-one".