18641087 has 2 divisors, whose sum is σ = 18641088. Its totient is φ = 18641086.

The previous prime is 18641069. The next prime is 18641099. The reversal of 18641087 is 78014681.

It is a strong prime.

It is an emirp because it is prime and its reverse (78014681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18641087 - 2²⁰ = 17592511 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18641047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9320543 + 9320544.

It is an arithmetic number, because the mean of its divisors is an integer number (9320544).

Almost surely, 2^18641087 is an apocalyptic number.

18641087 is a deficient number, since it is larger than the sum of its proper divisors (1).

18641087 is an equidigital number, since it uses as much as digits as its factorization.

18641087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 18641087 is about 4317.5325129060. The cubic root of 18641087 is about 265.1492549492.

The spelling of 18641087 in words is "eighteen million, six hundred forty-one thousand, eighty-seven".