18525531 has 16 divisors (see below), whose sum is σ = 25145120. Its totient is φ = 12130560.

The previous prime is 18525527. The next prime is 18525539. The reversal of 18525531 is 13552581.

It is not a de Polignac number, because 18525531 - 2² = 18525527 is a prime.

It is a super-2 number, since 2×18525531² = 686390597663922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18525539) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59031 + ... + 59343.

It is an arithmetic number, because the mean of its divisors is an integer number (1571570).

Almost surely, 2^18525531 is an apocalyptic number.

18525531 is a deficient number, since it is larger than the sum of its proper divisors (6619589).

18525531 is a wasteful number, since it uses less digits than its factorization.

18525531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606.

The product of its digits is 6000, while the sum is 30.

The square root of 18525531 is about 4304.1295287201. The cubic root of 18525531 is about 264.6002326418.

The spelling of 18525531 in words is "eighteen million, five hundred twenty-five thousand, five hundred thirty-one".