18700131 has 4 divisors (see below), whose sum is σ = 24933512. Its totient is φ = 12466752.

The previous prime is 18700117. The next prime is 18700163. The reversal of 18700131 is 13100781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13100781 = 3 ⋅4366927.

It is not a de Polignac number, because 18700131 - 2⁶ = 18700067 is a prime.

It is a super-2 number, since 2×18700131² = 699389798834322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18700098 and 18700107.

It is not an unprimeable number, because it can be changed into a prime (18700531) 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, 3116686 + ... + 3116691.

It is an arithmetic number, because the mean of its divisors is an integer number (6233378).

Almost surely, 2^18700131 is an apocalyptic number.

18700131 is a deficient number, since it is larger than the sum of its proper divisors (6233381).

18700131 is an equidigital number, since it uses as much as digits as its factorization.

18700131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6233380.

The product of its (nonzero) digits is 168, while the sum is 21.

The square root of 18700131 is about 4324.3648088477. The cubic root of 18700131 is about 265.4289055319.

The spelling of 18700131 in words is "eighteen million, seven hundred thousand, one hundred thirty-one".