18418511 has 4 divisors (see below), whose sum is σ = 18531672. Its totient is φ = 18305352.

The previous prime is 18418487. The next prime is 18418537. The reversal of 18418511 is 11581481.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18418511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18418571) 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, 56336 + ... + 56661.

It is an arithmetic number, because the mean of its divisors is an integer number (4632918).

Almost surely, 2^18418511 is an apocalyptic number.

18418511 is a deficient number, since it is larger than the sum of its proper divisors (113161).

18418511 is a wasteful number, since it uses less digits than its factorization.

18418511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113160.

The product of its digits is 1280, while the sum is 29.

The square root of 18418511 is about 4291.6792750624. The cubic root of 18418511 is about 264.0897259675.

Adding to 18418511 its reverse (11581481), we get a palindrome (29999992).

The spelling of 18418511 in words is "eighteen million, four hundred eighteen thousand, five hundred eleven".