18086131 has 4 divisors (see below), whose sum is σ = 20669872. Its totient is φ = 15502392.

The previous prime is 18086093. The next prime is 18086137. The reversal of 18086131 is 13168081.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13168081 = 17 ⋅774593.

It is a cyclic number.

It is not a de Polignac number, because 18086131 - 2¹⁷ = 17955059 is a prime.

It is a super-2 number, since 2×18086131² = 654216269098322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18086131.

It is not an unprimeable number, because it can be changed into a prime (18086137) 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, 1291860 + ... + 1291873.

It is an arithmetic number, because the mean of its divisors is an integer number (5167468).

Almost surely, 2^18086131 is an apocalyptic number.

18086131 is a deficient number, since it is larger than the sum of its proper divisors (2583741).

18086131 is an equidigital number, since it uses as much as digits as its factorization.

18086131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583740.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18086131 is about 4252.7792089409. The cubic root of 18086131 is about 262.4914875546.

The spelling of 18086131 in words is "eighteen million, eighty-six thousand, one hundred thirty-one".