122608891 has 2 divisors, whose sum is σ = 122608892. Its totient is φ = 122608890.

The previous prime is 122608807. The next prime is 122608907. The reversal of 122608891 is 198806221.

It is a strong prime.

It is an emirp because it is prime and its reverse (198806221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122608891 - 2¹¹ = 122606843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122608891.

It is not a weakly prime, because it can be changed into another prime (122602891) 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, 61304445 + 61304446.

It is an arithmetic number, because the mean of its divisors is an integer number (61304446).

Almost surely, 2^122608891 is an apocalyptic number.

122608891 is a deficient number, since it is larger than the sum of its proper divisors (1).

122608891 is an equidigital number, since it uses as much as digits as its factorization.

122608891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 122608891 is about 11072.8899118523. The cubic root of 122608891 is about 496.7913072966.

The spelling of 122608891 in words is "one hundred twenty-two million, six hundred eight thousand, eight hundred ninety-one".