312212122991 has 2 divisors, whose sum is σ = 312212122992. Its totient is φ = 312212122990.

The previous prime is 312212122987. The next prime is 312212123023. The reversal of 312212122991 is 199221212213.

It is a weak prime.

It is an emirp because it is prime and its reverse (199221212213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 312212122991 - 2² = 312212122987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (312212122951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156106061495 + 156106061496.

It is an arithmetic number, because the mean of its divisors is an integer number (156106061496).

Almost surely, 2^312212122991 is an apocalyptic number.

312212122991 is a deficient number, since it is larger than the sum of its proper divisors (1).

312212122991 is an equidigital number, since it uses as much as digits as its factorization.

312212122991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 35.

The spelling of 312212122991 in words is "three hundred twelve billion, two hundred twelve million, one hundred twenty-two thousand, nine hundred ninety-one".