122158753491 has 4 divisors (see below), whose sum is σ = 162878337992. Its totient is φ = 81439168992.

The previous prime is 122158753477. The next prime is 122158753529. The reversal of 122158753491 is 194357851221.

It is a happy number.

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

It is not a de Polignac number, because 122158753491 - 2¹⁰ = 122158752467 is a prime.

It is a super-2 number, since 2×122158753491² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122158753491.

It is not an unprimeable number, because it can be changed into a prime (122158753471) 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, 20359792246 + ... + 20359792251.

It is an arithmetic number, because the mean of its divisors is an integer number (40719584498).

Almost surely, 2^122158753491 is an apocalyptic number.

122158753491 is a deficient number, since it is larger than the sum of its proper divisors (40719584501).

122158753491 is an equidigital number, since it uses as much as digits as its factorization.

122158753491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40719584500.

The product of its digits is 604800, while the sum is 48.

The spelling of 122158753491 in words is "one hundred twenty-two billion, one hundred fifty-eight million, seven hundred fifty-three thousand, four hundred ninety-one".