122191 has 4 divisors (see below), whose sum is σ = 123984. Its totient is φ = 120400.

The previous prime is 122173. The next prime is 122201. The reversal of 122191 is 191221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191221 = 43 ⋅4447.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122191 is a prime.

It is a Duffinian number.

122191 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122131) 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, 790 + ... + 931.

It is an arithmetic number, because the mean of its divisors is an integer number (30996).

2¹²²¹⁹¹ is an apocalyptic number.

122191 is a deficient number, since it is larger than the sum of its proper divisors (1793).

122191 is an equidigital number, since it uses as much as digits as its factorization.

122191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1792.

The product of its digits is 36, while the sum is 16.

The square root of 122191 is about 349.5582927067. The cubic root of 122191 is about 49.6226256036.

It can be divided in two parts, 1221 and 91, that multiplied together give a palindrome (111111).

The spelling of 122191 in words is "one hundred twenty-two thousand, one hundred ninety-one".