312331213 has 2 divisors, whose sum is σ = 312331214. Its totient is φ = 312331212.

The previous prime is 312331211. The next prime is 312331277. The reversal of 312331213 is 312133213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237992329 + 74338884 = 15427^2 + 8622^2 .

It is a cyclic number.

It is not a de Polignac number, because 312331213 - 2¹ = 312331211 is a prime.

It is a super-2 number, since 2×312331213² = 195101573228102738, which contains 22 as substring.

Together with 312331211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312331211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156165606 + 156165607.

It is an arithmetic number, because the mean of its divisors is an integer number (156165607).

Almost surely, 2^312331213 is an apocalyptic number.

It is an amenable number.

312331213 is a deficient number, since it is larger than the sum of its proper divisors (1).

312331213 is an equidigital number, since it uses as much as digits as its factorization.

312331213 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 312331213 is about 17672.8948675648. The cubic root of 312331213 is about 678.4822065707.

Adding to 312331213 its reverse (312133213), we get a palindrome (624464426).

The spelling of 312331213 in words is "three hundred twelve million, three hundred thirty-one thousand, two hundred thirteen".