18124531 has 4 divisors (see below), whose sum is σ = 18148752. Its totient is φ = 18100312.

The previous prime is 18124523. The next prime is 18124541. The reversal of 18124531 is 13542181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13542181 = 101 ⋅134081.

It is a cyclic number.

It is not a de Polignac number, because 18124531 - 2³ = 18124523 is a prime.

It is a super-2 number, since 2×18124531² = 656997247939922, 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 = 18124496 and 18124505.

It is not an unprimeable number, because it can be changed into a prime (18124511) 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, 10951 + ... + 12496.

It is an arithmetic number, because the mean of its divisors is an integer number (4537188).

Almost surely, 2^18124531 is an apocalyptic number.

18124531 is a deficient number, since it is larger than the sum of its proper divisors (24221).

18124531 is an equidigital number, since it uses as much as digits as its factorization.

18124531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24220.

The product of its digits is 960, while the sum is 25.

The square root of 18124531 is about 4257.2915098687. The cubic root of 18124531 is about 262.6771279199.

The spelling of 18124531 in words is "eighteen million, one hundred twenty-four thousand, five hundred thirty-one".