18900131 has 4 divisors (see below), whose sum is σ = 19020672. Its totient is φ = 18779592.

The previous prime is 18900127. The next prime is 18900143. The reversal of 18900131 is 13100981.

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 18900131 - 2² = 18900127 is a prime.

It is a super-2 number, since 2×18900131² = 714429903634322, 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 = 18900097 and 18900106.

It is not an unprimeable number, because it can be changed into a prime (18900121) 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, 60035 + ... + 60348.

It is an arithmetic number, because the mean of its divisors is an integer number (4755168).

Almost surely, 2^18900131 is an apocalyptic number.

18900131 is a deficient number, since it is larger than the sum of its proper divisors (120541).

18900131 is a wasteful number, since it uses less digits than its factorization.

18900131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120540.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 18900131 is about 4347.4280902621. The cubic root of 18900131 is about 266.3718159469.

The spelling of 18900131 in words is "eighteen million, nine hundred thousand, one hundred thirty-one".