18508541 has 2 divisors, whose sum is σ = 18508542. Its totient is φ = 18508540.

The previous prime is 18508513. The next prime is 18508579. The reversal of 18508541 is 14580581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 624100 = 4229^2 + 790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18508541 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18508498 and 18508507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18508591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9254270 + 9254271.

It is an arithmetic number, because the mean of its divisors is an integer number (9254271).

Almost surely, 2^18508541 is an apocalyptic number.

It is an amenable number.

18508541 is a deficient number, since it is larger than the sum of its proper divisors (1).

18508541 is an equidigital number, since it uses as much as digits as its factorization.

18508541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 18508541 is about 4302.1553900342. The cubic root of 18508541 is about 264.5193184885.

The spelling of 18508541 in words is "eighteen million, five hundred eight thousand, five hundred forty-one".