122091 has 4 divisors (see below), whose sum is σ = 162792. Its totient is φ = 81392.

The previous prime is 122081. The next prime is 122099. The reversal of 122091 is 190221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 122091 - 2⁶ = 122027 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 122091.

It is not an unprimeable number, because it can be changed into a prime (122099) 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, 20346 + ... + 20351.

It is an arithmetic number, because the mean of its divisors is an integer number (40698).

2¹²²⁰⁹¹ is an apocalyptic number.

122091 is a deficient number, since it is larger than the sum of its proper divisors (40701).

122091 is an equidigital number, since it uses as much as digits as its factorization.

122091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40700.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 122091 is about 349.4152257701. The cubic root of 122091 is about 49.6090850077.

The spelling of 122091 in words is "one hundred twenty-two thousand, ninety-one".