122155109 has 2 divisors, whose sum is σ = 122155110. Its totient is φ = 122155108.

The previous prime is 122155087. The next prime is 122155129. The reversal of 122155109 is 901551221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121660900 + 494209 = 11030^2 + 703^2 .

It is a cyclic number.

It is not a de Polignac number, because 122155109 - 2⁸ = 122154853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122155129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61077554 + 61077555.

It is an arithmetic number, because the mean of its divisors is an integer number (61077555).

Almost surely, 2^122155109 is an apocalyptic number.

It is an amenable number.

122155109 is a deficient number, since it is larger than the sum of its proper divisors (1).

122155109 is an equidigital number, since it uses as much as digits as its factorization.

122155109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 122155109 is about 11052.3802413779. The cubic root of 122155109 is about 496.1776659856.

The spelling of 122155109 in words is "one hundred twenty-two million, one hundred fifty-five thousand, one hundred nine".