18053531 has 4 divisors (see below), whose sum is σ = 18228912. Its totient is φ = 17878152.

The previous prime is 18053513. The next prime is 18053533. The reversal of 18053531 is 13535081.

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 18053531 - 2¹⁴ = 18037147 is a prime.

It is a super-2 number, since 2×18053531² = 651859963135922, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 18053531.

It is not an unprimeable number, because it can be changed into a prime (18053533) 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, 87536 + ... + 87741.

It is an arithmetic number, because the mean of its divisors is an integer number (4557228).

Almost surely, 2^18053531 is an apocalyptic number.

18053531 is a deficient number, since it is larger than the sum of its proper divisors (175381).

18053531 is a wasteful number, since it uses less digits than its factorization.

18053531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175380.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 18053531 is about 4248.9446925090. The cubic root of 18053531 is about 262.3336802810. Note that the first 3 decimals are identical.

The spelling of 18053531 in words is "eighteen million, fifty-three thousand, five hundred thirty-one".