18587641 has 2 divisors, whose sum is σ = 18587642. Its totient is φ = 18587640.

The previous prime is 18587629. The next prime is 18587651. The reversal of 18587641 is 14678581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17464041 + 1123600 = 4179^2 + 1060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18587641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18587594 and 18587603.

It is not a weakly prime, because it can be changed into another prime (18587651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9293820 + 9293821.

It is an arithmetic number, because the mean of its divisors is an integer number (9293821).

Almost surely, 2^18587641 is an apocalyptic number.

It is an amenable number.

18587641 is a deficient number, since it is larger than the sum of its proper divisors (1).

18587641 is an equidigital number, since it uses as much as digits as its factorization.

18587641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 40.

The square root of 18587641 is about 4311.3386552207. The cubic root of 18587641 is about 264.8956085799.

The spelling of 18587641 in words is "eighteen million, five hundred eighty-seven thousand, six hundred forty-one".