122112031991 has 2 divisors, whose sum is σ = 122112031992. Its totient is φ = 122112031990.

The previous prime is 122112031973. The next prime is 122112032039. The reversal of 122112031991 is 199130211221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 122112031991 - 2¹⁰ = 122112030967 is a prime.

It is a super-2 number, since 2×122112031991² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122112030991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61056015995 + 61056015996.

It is an arithmetic number, because the mean of its divisors is an integer number (61056015996).

Almost surely, 2^122112031991 is an apocalyptic number.

122112031991 is a deficient number, since it is larger than the sum of its proper divisors (1).

122112031991 is an equidigital number, since it uses as much as digits as its factorization.

122112031991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 122112031991 in words is "one hundred twenty-two billion, one hundred twelve million, thirty-one thousand, nine hundred ninety-one".