18519133 has 2 divisors, whose sum is σ = 18519134. Its totient is φ = 18519132.

The previous prime is 18519107. The next prime is 18519157. The reversal of 18519133 is 33191581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17791524 + 727609 = 4218^2 + 853^2 .

It is an emirp because it is prime and its reverse (33191581) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18519133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18519095 and 18519104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18519233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9259566 + 9259567.

It is an arithmetic number, because the mean of its divisors is an integer number (9259567).

Almost surely, 2^18519133 is an apocalyptic number.

It is an amenable number.

18519133 is a deficient number, since it is larger than the sum of its proper divisors (1).

18519133 is an equidigital number, since it uses as much as digits as its factorization.

18519133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 31.

The square root of 18519133 is about 4303.3862248234. The cubic root of 18519133 is about 264.5697682480.

The spelling of 18519133 in words is "eighteen million, five hundred nineteen thousand, one hundred thirty-three".