18522487 has 2 divisors, whose sum is σ = 18522488. Its totient is φ = 18522486.

The previous prime is 18522481. The next prime is 18522527. The reversal of 18522487 is 78422581.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18522487 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 (18522481) 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, 9261243 + 9261244.

It is an arithmetic number, because the mean of its divisors is an integer number (9261244).

Almost surely, 2^18522487 is an apocalyptic number.

18522487 is a deficient number, since it is larger than the sum of its proper divisors (1).

18522487 is an equidigital number, since it uses as much as digits as its factorization.

18522487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35840, while the sum is 37.

The square root of 18522487 is about 4303.7759002996. The cubic root of 18522487 is about 264.5857393599.

The spelling of 18522487 in words is "eighteen million, five hundred twenty-two thousand, four hundred eighty-seven".