18126531 has 8 divisors (see below), whose sum is σ = 26854160. Its totient is φ = 12084336.

The previous prime is 18126523. The next prime is 18126533. The reversal of 18126531 is 13562181.

18126531 is a `hidden beast` number, since 1 + 8 + 1 + 2 + 653 + 1 = 666.

It is not a de Polignac number, because 18126531 - 2³ = 18126523 is a prime.

It is a super-2 number, since 2×18126531² = 657142252187922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 671353 = 18126531 / (1 + 8 + 1 + 2 + 6 + 5 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18126495 and 18126504.

It is not an unprimeable number, because it can be changed into a prime (18126533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335650 + ... + 335703.

It is an arithmetic number, because the mean of its divisors is an integer number (3356770).

Almost surely, 2^18126531 is an apocalyptic number.

18126531 is a deficient number, since it is larger than the sum of its proper divisors (8727629).

18126531 is an equidigital number, since it uses as much as digits as its factorization.

18126531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671362 (or 671356 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 18126531 is about 4257.5263945160. The cubic root of 18126531 is about 262.6867895020.

The spelling of 18126531 in words is "eighteen million, one hundred twenty-six thousand, five hundred thirty-one".