18528131 has 4 divisors (see below), whose sum is σ = 18555264. Its totient is φ = 18501000.

The previous prime is 18528119. The next prime is 18528137. The reversal of 18528131 is 13182581.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18528131 is a prime.

It is a super-2 number, since 2×18528131² = 686583276706322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18528094 and 18528103.

It is not an unprimeable number, because it can be changed into a prime (18528137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12515 + ... + 13916.

It is an arithmetic number, because the mean of its divisors is an integer number (4638816).

Almost surely, 2^18528131 is an apocalyptic number.

18528131 is a deficient number, since it is larger than the sum of its proper divisors (27133).

18528131 is an equidigital number, since it uses as much as digits as its factorization.

18528131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27132.

The product of its digits is 1920, while the sum is 29.

The square root of 18528131 is about 4304.4315536433. The cubic root of 18528131 is about 264.6126106662.

The spelling of 18528131 in words is "eighteen million, five hundred twenty-eight thousand, one hundred thirty-one".