18849559 has 2 divisors, whose sum is σ = 18849560. Its totient is φ = 18849558.

The previous prime is 18849557. The next prime is 18849601. The reversal of 18849559 is 95594881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18849559 - 2¹ = 18849557 is a prime.

Together with 18849557, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18849557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9424779 + 9424780.

It is an arithmetic number, because the mean of its divisors is an integer number (9424780).

Almost surely, 2^18849559 is an apocalyptic number.

18849559 is a deficient number, since it is larger than the sum of its proper divisors (1).

18849559 is an equidigital number, since it uses as much as digits as its factorization.

18849559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 49.

The square root of 18849559 is about 4341.6078818797. The cubic root of 18849559 is about 266.1340223864.

The spelling of 18849559 in words is "eighteen million, eight hundred forty-nine thousand, five hundred fifty-nine".