18513133 has 2 divisors, whose sum is σ = 18513134. Its totient is φ = 18513132.

The previous prime is 18513127. The next prime is 18513149. The reversal of 18513133 is 33131581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18507204 + 5929 = 4302^2 + 77^2 .

It is a cyclic number.

It is not a de Polignac number, because 18513133 - 2⁹ = 18512621 is a prime.

It is equal to p_1181923 and since 18513133 and 1181923 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 18513098 and 18513107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18513113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9256566 + 9256567.

It is an arithmetic number, because the mean of its divisors is an integer number (9256567).

Almost surely, 2^18513133 is an apocalyptic number.

It is an amenable number.

18513133 is a deficient number, since it is larger than the sum of its proper divisors (1).

18513133 is an equidigital number, since it uses as much as digits as its factorization.

18513133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 18513133 is about 4302.6890429126. The cubic root of 18513133 is about 264.5411925748.

The spelling of 18513133 in words is "eighteen million, five hundred thirteen thousand, one hundred thirty-three".