312131233 has 2 divisors, whose sum is σ = 312131234. Its totient is φ = 312131232.

The previous prime is 312131207. The next prime is 312131251. The reversal of 312131233 is 332131213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171400464 + 140730769 = 13092^2 + 11863^2 .

It is an emirp because it is prime and its reverse (332131213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312131233 is a prime.

It is a super-2 number, since 2×312131233² = 194851813228200578, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 312131233.

It is not a weakly prime, because it can be changed into another prime (312131273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156065616 + 156065617.

It is an arithmetic number, because the mean of its divisors is an integer number (156065617).

Almost surely, 2^312131233 is an apocalyptic number.

It is an amenable number.

312131233 is a deficient number, since it is larger than the sum of its proper divisors (1).

312131233 is an equidigital number, since it uses as much as digits as its factorization.

312131233 is an odious number, because the sum of its binary digits is odd.

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

The square root of 312131233 is about 17667.2361449096. The cubic root of 312131233 is about 678.3373690449.

Adding to 312131233 its reverse (332131213), we get a palindrome (644262446).

The spelling of 312131233 in words is "three hundred twelve million, one hundred thirty-one thousand, two hundred thirty-three".