122866109 has 2 divisors, whose sum is σ = 122866110. Its totient is φ = 122866108.

The previous prime is 122866099. The next prime is 122866111. The reversal of 122866109 is 901668221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120934009 + 1932100 = 10997^2 + 1390^2 .

It is an emirp because it is prime and its reverse (901668221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122866109 - 2²⁴ = 106088893 is a prime.

It is a Sophie Germain prime.

Together with 122866111, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122866129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61433054 + 61433055.

It is an arithmetic number, because the mean of its divisors is an integer number (61433055).

Almost surely, 2^122866109 is an apocalyptic number.

It is an amenable number.

122866109 is a deficient number, since it is larger than the sum of its proper divisors (1).

122866109 is an equidigital number, since it uses as much as digits as its factorization.

122866109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 122866109 is about 11084.4985903739. The cubic root of 122866109 is about 497.1384664937.

The spelling of 122866109 in words is "one hundred twenty-two million, eight hundred sixty-six thousand, one hundred nine".