45531 has 6 divisors (see below), whose sum is σ = 65780. Its totient is φ = 30348.

The previous prime is 45523. The next prime is 45533. The reversal of 45531 is 13554.

It is not a de Polignac number, because 45531 - 2³ = 45523 is a prime.

It is a super-2 number, since 2×45531² = 4146143922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45533) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2521 + ... + 2538.

2⁴⁵⁵³¹ is an apocalyptic number.

45531 is a deficient number, since it is larger than the sum of its proper divisors (20249).

45531 is a wasteful number, since it uses less digits than its factorization.

45531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5065 (or 5062 counting only the distinct ones).

The product of its digits is 300, while the sum is 18.

The square root of 45531 is about 213.3799428250. The cubic root of 45531 is about 35.7082908033.

It can be divided in two parts, 4553 and 1, that added together give a palindrome (4554).

The spelling of 45531 in words is "forty-five thousand, five hundred thirty-one".