18928126131 has 4 divisors (see below), whose sum is σ = 25237501512. Its totient is φ = 12618750752.

The previous prime is 18928126057. The next prime is 18928126163. The reversal of 18928126131 is 13162182981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13162182981 = 3 ⋅4387394327.

It is a cyclic number.

It is not a de Polignac number, because 18928126131 - 2²³ = 18919737523 is a prime.

It is a super-2 number, since 2×18928126131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18928126171) 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, 3154687686 + ... + 3154687691.

It is an arithmetic number, because the mean of its divisors is an integer number (6309375378).

Almost surely, 2^18928126131 is an apocalyptic number.

18928126131 is a deficient number, since it is larger than the sum of its proper divisors (6309375381).

18928126131 is an equidigital number, since it uses as much as digits as its factorization.

18928126131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6309375380.

The product of its digits is 41472, while the sum is 42.

The spelling of 18928126131 in words is "eighteen billion, nine hundred twenty-eight million, one hundred twenty-six thousand, one hundred thirty-one".