312222220631 has 2 divisors, whose sum is σ = 312222220632. Its totient is φ = 312222220630.

The previous prime is 312222220627. The next prime is 312222220649. The reversal of 312222220631 is 136022222213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312222220631 - 2² = 312222220627 is a prime.

It is a super-2 number, since 2×312222220631² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 312222220631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312222223631) 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, 156111110315 + 156111110316.

It is an arithmetic number, because the mean of its divisors is an integer number (156111110316).

Almost surely, 2^312222220631 is an apocalyptic number.

312222220631 is a deficient number, since it is larger than the sum of its proper divisors (1).

312222220631 is an equidigital number, since it uses as much as digits as its factorization.

312222220631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 312222220631 its reverse (136022222213), we get a palindrome (448244442844).

The spelling of 312222220631 in words is "three hundred twelve billion, two hundred twenty-two million, two hundred twenty thousand, six hundred thirty-one".