18899113 has 2 divisors, whose sum is σ = 18899114. Its totient is φ = 18899112.

The previous prime is 18899099. The next prime is 18899131. The reversal of 18899113 is 31199881.

It is a happy number.

Together with next prime (18899131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18896409 + 2704 = 4347^2 + 52^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18899113 is a prime.

It is not a weakly prime, because it can be changed into another prime (18899173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9449556 + 9449557.

It is an arithmetic number, because the mean of its divisors is an integer number (9449557).

Almost surely, 2^18899113 is an apocalyptic number.

It is an amenable number.

18899113 is a deficient number, since it is larger than the sum of its proper divisors (1).

18899113 is an equidigital number, since it uses as much as digits as its factorization.

18899113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 40.

The square root of 18899113 is about 4347.3110079680. The cubic root of 18899113 is about 266.3670334161.

The spelling of 18899113 in words is "eighteen million, eight hundred ninety-nine thousand, one hundred thirteen".