122909091 has 4 divisors (see below), whose sum is σ = 163878792. Its totient is φ = 81939392.

The previous prime is 122909077. The next prime is 122909107. The reversal of 122909091 is 190909221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190909221 = 3 ⋅63636407.

It is a cyclic number.

It is not a de Polignac number, because 122909091 - 2²⁵ = 89354659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (122909011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20484846 + ... + 20484851.

It is an arithmetic number, because the mean of its divisors is an integer number (40969698).

Almost surely, 2^122909091 is an apocalyptic number.

122909091 is a deficient number, since it is larger than the sum of its proper divisors (40969701).

122909091 is an equidigital number, since it uses as much as digits as its factorization.

122909091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40969700.

The product of its (nonzero) digits is 2916, while the sum is 33.

The square root of 122909091 is about 11086.4372545918. The cubic root of 122909091 is about 497.1964307133.

The spelling of 122909091 in words is "one hundred twenty-two million, nine hundred nine thousand, ninety-one".