18823123131 has 4 divisors (see below), whose sum is σ = 25097497512. Its totient is φ = 12548748752.

The previous prime is 18823123117. The next prime is 18823123133. The reversal of 18823123131 is 13132132881.

It is a happy number.

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 18823123131 - 2¹³ = 18823114939 is a prime.

It is a super-2 number, since 2×18823123131² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18823123092 and 18823123101.

It is not an unprimeable number, because it can be changed into a prime (18823123133) 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, 3137187186 + ... + 3137187191.

It is an arithmetic number, because the mean of its divisors is an integer number (6274374378).

Almost surely, 2^18823123131 is an apocalyptic number.

18823123131 is a deficient number, since it is larger than the sum of its proper divisors (6274374381).

18823123131 is an equidigital number, since it uses as much as digits as its factorization.

18823123131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6274374380.

The product of its digits is 6912, while the sum is 33.

The spelling of 18823123131 in words is "eighteen billion, eight hundred twenty-three million, one hundred twenty-three thousand, one hundred thirty-one".