18120131123 has 4 divisors (see below), whose sum is σ = 18126877440. Its totient is φ = 18113384808.

The previous prime is 18120131111. The next prime is 18120131137. The reversal of 18120131123 is 32113102181.

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 18120131123 - 2⁶ = 18120131059 is a prime.

It is a super-2 number, since 2×18120131123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18120139123) 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, 3369128 + ... + 3374501.

It is an arithmetic number, because the mean of its divisors is an integer number (4531719360).

Almost surely, 2^18120131123 is an apocalyptic number.

18120131123 is a deficient number, since it is larger than the sum of its proper divisors (6746317).

18120131123 is an equidigital number, since it uses as much as digits as its factorization.

18120131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6746316.

The product of its (nonzero) digits is 288, while the sum is 23.

The spelling of 18120131123 in words is "eighteen billion, one hundred twenty million, one hundred thirty-one thousand, one hundred twenty-three".