122331991 has 2 divisors, whose sum is σ = 122331992. Its totient is φ = 122331990.

The previous prime is 122331961. The next prime is 122331997. The reversal of 122331991 is 199133221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 122331991 - 2⁵ = 122331959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122331997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61165995 + 61165996.

It is an arithmetic number, because the mean of its divisors is an integer number (61165996).

Almost surely, 2^122331991 is an apocalyptic number.

122331991 is a deficient number, since it is larger than the sum of its proper divisors (1).

122331991 is an equidigital number, since it uses as much as digits as its factorization.

122331991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 31.

The square root of 122331991 is about 11060.3793334587. The cubic root of 122331991 is about 496.4170408022.

The spelling of 122331991 in words is "one hundred twenty-two million, three hundred thirty-one thousand, nine hundred ninety-one".