312212077691 has 2 divisors, whose sum is σ = 312212077692. Its totient is φ = 312212077690.

The previous prime is 312212077679. The next prime is 312212077739. The reversal of 312212077691 is 196770212213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 312212077691 - 2²⁶ = 312144968827 is a prime.

It is a super-2 number, since 2×312212077691² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (312212077091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156106038845 + 156106038846.

It is an arithmetic number, because the mean of its divisors is an integer number (156106038846).

Almost surely, 2^312212077691 is an apocalyptic number.

312212077691 is a deficient number, since it is larger than the sum of its proper divisors (1).

312212077691 is an equidigital number, since it uses as much as digits as its factorization.

312212077691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The spelling of 312212077691 in words is "three hundred twelve billion, two hundred twelve million, seventy-seven thousand, six hundred ninety-one".