122415991 has 2 divisors, whose sum is σ = 122415992. Its totient is φ = 122415990.

The previous prime is 122415977. The next prime is 122416001. The reversal of 122415991 is 199514221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 122415991 - 2⁹ = 122415479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122415941) 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, 61207995 + 61207996.

It is an arithmetic number, because the mean of its divisors is an integer number (61207996).

Almost surely, 2^122415991 is an apocalyptic number.

122415991 is a deficient number, since it is larger than the sum of its proper divisors (1).

122415991 is an equidigital number, since it uses as much as digits as its factorization.

122415991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 122415991 is about 11064.1760199303. The cubic root of 122415991 is about 496.5306373914.

The spelling of 122415991 in words is "one hundred twenty-two million, four hundred fifteen thousand, nine hundred ninety-one".