122397991187 has 2 divisors, whose sum is σ = 122397991188. Its totient is φ = 122397991186.

The previous prime is 122397991181. The next prime is 122397991237. The reversal of 122397991187 is 781199793221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 122397991187 - 2¹⁶ = 122397925651 is a prime.

It is a super-2 number, since 2×122397991187² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (122397991181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61198995593 + 61198995594.

It is an arithmetic number, because the mean of its divisors is an integer number (61198995594).

Almost surely, 2^122397991187 is an apocalyptic number.

122397991187 is a deficient number, since it is larger than the sum of its proper divisors (1).

122397991187 is an equidigital number, since it uses as much as digits as its factorization.

122397991187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3429216, while the sum is 59.

The spelling of 122397991187 in words is "one hundred twenty-two billion, three hundred ninety-seven million, nine hundred ninety-one thousand, one hundred eighty-seven".