122491 has 4 divisors (see below), whose sum is σ = 123192. Its totient is φ = 121792.

The previous prime is 122489. The next prime is 122497. The reversal of 122491 is 194221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 194221 = 167 ⋅1163.

It is a cyclic number.

It is not a de Polignac number, because 122491 - 2¹ = 122489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122497) 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 3 ways as a sum of consecutive naturals, for example, 171 + ... + 523.

It is an arithmetic number, because the mean of its divisors is an integer number (30798).

2¹²²⁴⁹¹ is an apocalyptic number.

122491 is a deficient number, since it is larger than the sum of its proper divisors (701).

122491 is an equidigital number, since it uses as much as digits as its factorization.

122491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700.

The product of its digits is 144, while the sum is 19.

The square root of 122491 is about 349.9871426210. The cubic root of 122491 is about 49.6632031177.

It can be divided in two parts, 12 and 2491, that multiplied together give a palindrome (29892).

The spelling of 122491 in words is "one hundred twenty-two thousand, four hundred ninety-one".