18449911 has 2 divisors, whose sum is σ = 18449912. Its totient is φ = 18449910.

The previous prime is 18449891. The next prime is 18449923. The reversal of 18449911 is 11994481.

It is a strong prime.

It is an emirp because it is prime and its reverse (11994481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18449911 - 2¹⁵ = 18417143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18449311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9224955 + 9224956.

It is an arithmetic number, because the mean of its divisors is an integer number (9224956).

Almost surely, 2^18449911 is an apocalyptic number.

18449911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18449911 is an equidigital number, since it uses as much as digits as its factorization.

18449911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 37.

The square root of 18449911 is about 4295.3359589210. The cubic root of 18449911 is about 264.2397147393.

The spelling of 18449911 in words is "eighteen million, four hundred forty-nine thousand, nine hundred eleven".