313123231 has 2 divisors, whose sum is σ = 313123232. Its totient is φ = 313123230.

The previous prime is 313123229. The next prime is 313123247. The reversal of 313123231 is 132321313.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 313123231 - 2¹ = 313123229 is a prime.

It is a super-2 number, since 2×313123231² = 196092315583758722, which contains 22 as substring.

Together with 313123229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 313123199 and 313123208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (313123201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156561615 + 156561616.

It is an arithmetic number, because the mean of its divisors is an integer number (156561616).

Almost surely, 2^313123231 is an apocalyptic number.

313123231 is a deficient number, since it is larger than the sum of its proper divisors (1).

313123231 is an equidigital number, since it uses as much as digits as its factorization.

313123231 is an evil number, because the sum of its binary digits is even.

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

The square root of 313123231 is about 17695.2883841999. The cubic root of 313123231 is about 679.0552270383.

Adding to 313123231 its reverse (132321313), we get a palindrome (445444544).

It can be divided in two parts, 31312 and 3231, that added together give a palindrome (34543).

The spelling of 313123231 in words is "three hundred thirteen million, one hundred twenty-three thousand, two hundred thirty-one".