18135211 has 4 divisors (see below), whose sum is σ = 18144424. Its totient is φ = 18126000.

The previous prime is 18135203. The next prime is 18135223. The reversal of 18135211 is 11253181.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18135211 - 2³ = 18135203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18136211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330 + ... + 6031.

It is an arithmetic number, because the mean of its divisors is an integer number (4536106).

Almost surely, 2^18135211 is an apocalyptic number.

18135211 is a deficient number, since it is larger than the sum of its proper divisors (9213).

18135211 is an equidigital number, since it uses as much as digits as its factorization.

18135211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9212.

The product of its digits is 240, while the sum is 22.

The square root of 18135211 is about 4258.5456437615. The cubic root of 18135211 is about 262.7287125351.

Adding to 18135211 its reverse (11253181), we get a palindrome (29388392).

The spelling of 18135211 in words is "eighteen million, one hundred thirty-five thousand, two hundred eleven".