312122111993 has 2 divisors, whose sum is σ = 312122111994. Its totient is φ = 312122111992.

The previous prime is 312122111969. The next prime is 312122112011. The reversal of 312122111993 is 399111221213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191294266384 + 120827845609 = 437372^2 + 347603^2 .

It is a cyclic number.

It is not a de Polignac number, because 312122111993 - 2⁶ = 312122111929 is a prime.

It is not a weakly prime, because it can be changed into another prime (312122161993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156061055996 + 156061055997.

It is an arithmetic number, because the mean of its divisors is an integer number (156061055997).

Almost surely, 2^312122111993 is an apocalyptic number.

It is an amenable number.

312122111993 is a deficient number, since it is larger than the sum of its proper divisors (1).

312122111993 is an equidigital number, since it uses as much as digits as its factorization.

312122111993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 35.

The spelling of 312122111993 in words is "three hundred twelve billion, one hundred twenty-two million, one hundred eleven thousand, nine hundred ninety-three".