313123321 has 4 divisors (see below), whose sum is σ = 357855232. Its totient is φ = 268391412.

The previous prime is 313123313. The next prime is 313123333. The reversal of 313123321 is 123321313.

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 313123321 - 2³ = 313123313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (313121321) 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, 22365945 + ... + 22365958.

It is an arithmetic number, because the mean of its divisors is an integer number (89463808).

Almost surely, 2^313123321 is an apocalyptic number.

It is an amenable number.

313123321 is a deficient number, since it is larger than the sum of its proper divisors (44731911).

313123321 is an equidigital number, since it uses as much as digits as its factorization.

313123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44731910.

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

The square root of 313123321 is about 17695.2909272495. The cubic root of 313123321 is about 679.0552920979.

Adding to 313123321 its reverse (123321313), we get a palindrome (436444634).

The spelling of 313123321 in words is "three hundred thirteen million, one hundred twenty-three thousand, three hundred twenty-one".