18040531 has 2 divisors, whose sum is σ = 18040532. Its totient is φ = 18040530.

The previous prime is 18040513. The next prime is 18040541. The reversal of 18040531 is 13504081.

Together with previous prime (18040513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18040531 - 2⁵ = 18040499 is a prime.

It is a super-2 number, since 2×18040531² = 650921517523922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18040541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9020265 + 9020266.

It is an arithmetic number, because the mean of its divisors is an integer number (9020266).

Almost surely, 2^18040531 is an apocalyptic number.

18040531 is a deficient number, since it is larger than the sum of its proper divisors (1).

18040531 is an equidigital number, since it uses as much as digits as its factorization.

18040531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18040531 is about 4247.4146253927. The cubic root of 18040531 is about 262.2706980174.

The spelling of 18040531 in words is "eighteen million, forty thousand, five hundred thirty-one".