18042131 has 4 divisors (see below), whose sum is σ = 18114264. Its totient is φ = 17970000.

The previous prime is 18042121. The next prime is 18042139. The reversal of 18042131 is 13124081.

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 18042131 - 2⁶ = 18042067 is a prime.

It is a super-2 number, since 2×18042131² = 651036982042322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18042139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35690 + ... + 36191.

It is an arithmetic number, because the mean of its divisors is an integer number (4528566).

Almost surely, 2^18042131 is an apocalyptic number.

18042131 is a deficient number, since it is larger than the sum of its proper divisors (72133).

18042131 is an equidigital number, since it uses as much as digits as its factorization.

18042131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72132.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18042131 is about 4247.6029710885. The cubic root of 18042131 is about 262.2784513130.

The spelling of 18042131 in words is "eighteen million, forty-two thousand, one hundred thirty-one".