122138822809 has 2 divisors, whose sum is σ = 122138822810. Its totient is φ = 122138822808.

The previous prime is 122138822803. The next prime is 122138822857. The reversal of 122138822809 is 908228831221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71731837584 + 50406985225 = 267828^2 + 224515^2 .

It is a cyclic number.

It is not a de Polignac number, because 122138822809 - 2¹¹ = 122138820761 is a prime.

It is not a weakly prime, because it can be changed into another prime (122138822803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61069411404 + 61069411405.

It is an arithmetic number, because the mean of its divisors is an integer number (61069411405).

Almost surely, 2^122138822809 is an apocalyptic number.

It is an amenable number.

122138822809 is a deficient number, since it is larger than the sum of its proper divisors (1).

122138822809 is an equidigital number, since it uses as much as digits as its factorization.

122138822809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 46.

The spelling of 122138822809 in words is "one hundred twenty-two billion, one hundred thirty-eight million, eight hundred twenty-two thousand, eight hundred nine".