18509011 has 2 divisors, whose sum is σ = 18509012. Its totient is φ = 18509010.

The previous prime is 18509003. The next prime is 18509033. The reversal of 18509011 is 11090581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18509011 - 2³ = 18509003 is a prime.

It is not a weakly prime, because it can be changed into another prime (18501011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9254505 + 9254506.

It is an arithmetic number, because the mean of its divisors is an integer number (9254506).

Almost surely, 2^18509011 is an apocalyptic number.

18509011 is a deficient number, since it is larger than the sum of its proper divisors (1).

18509011 is an equidigital number, since it uses as much as digits as its factorization.

18509011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 18509011 is about 4302.2100134698. The cubic root of 18509011 is about 264.5215575093.

Adding to 18509011 its reverse (11090581), we get a palindrome (29599592).

The spelling of 18509011 in words is "eighteen million, five hundred nine thousand, eleven".