18244531 has 2 divisors, whose sum is σ = 18244532. Its totient is φ = 18244530.

The previous prime is 18244469. The next prime is 18244559. The reversal of 18244531 is 13544281.

It is an a-pointer prime, because the next prime (18244559) can be obtained adding 18244531 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18244531 - 2⁷ = 18244403 is a prime.

It is a super-2 number, since 2×18244531² = 665725822819922, which contains 22 as substring.

It is equal to p_1165924 and since 18244531 and 1165924 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18244531.

It is not a weakly prime, because it can be changed into another prime (18244591) 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 as a sum of consecutive naturals, namely, 9122265 + 9122266.

It is an arithmetic number, because the mean of its divisors is an integer number (9122266).

Almost surely, 2^18244531 is an apocalyptic number.

18244531 is a deficient number, since it is larger than the sum of its proper divisors (1).

18244531 is an equidigital number, since it uses as much as digits as its factorization.

18244531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 28.

The square root of 18244531 is about 4271.3617266628. The cubic root of 18244531 is about 263.2555694468.

The spelling of 18244531 in words is "eighteen million, two hundred forty-four thousand, five hundred thirty-one".