122209891 has 8 divisors (see below), whose sum is σ = 125432064. Its totient is φ = 119021760.

The previous prime is 122209883. The next prime is 122209897. The reversal of 122209891 is 198902221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 122209891 - 2³ = 122209883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122209897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1155 + ... + 15676.

It is an arithmetic number, because the mean of its divisors is an integer number (15679008).

Almost surely, 2^122209891 is an apocalyptic number.

122209891 is a deficient number, since it is larger than the sum of its proper divisors (3222173).

122209891 is a wasteful number, since it uses less digits than its factorization.

122209891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17021.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 122209891 is about 11054.8582532749. The cubic root of 122209891 is about 496.2518272789.

The spelling of 122209891 in words is "one hundred twenty-two million, two hundred nine thousand, eight hundred ninety-one".