122638492731 has 4 divisors (see below), whose sum is σ = 163517990312. Its totient is φ = 81758995152.

The previous prime is 122638492687. The next prime is 122638492759. The reversal of 122638492731 is 137294836221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137294836221 = 3 ⋅45764945407.

It is not a de Polignac number, because 122638492731 - 2¹⁰ = 122638491707 is a prime.

It is a super-2 number, since 2×122638492731² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122638492771) 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, 20439748786 + ... + 20439748791.

It is an arithmetic number, because the mean of its divisors is an integer number (40879497578).

Almost surely, 2^122638492731 is an apocalyptic number.

122638492731 is a deficient number, since it is larger than the sum of its proper divisors (40879497581).

122638492731 is an equidigital number, since it uses as much as digits as its factorization.

122638492731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40879497580.

The product of its digits is 870912, while the sum is 48.

The spelling of 122638492731 in words is "one hundred twenty-two billion, six hundred thirty-eight million, four hundred ninety-two thousand, seven hundred thirty-one".