18089513 has 8 divisors (see below), whose sum is σ = 20627208. Its totient is φ = 15715584.

The previous prime is 18089503. The next prime is 18089543. The reversal of 18089513 is 31598081.

It can be written as a sum of positive squares in 4 ways, for example, as 5607424 + 12482089 = 2368^2 + 3533^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18089513 - 2⁴ = 18089497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18089503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40706 + ... + 41147.

It is an arithmetic number, because the mean of its divisors is an integer number (2578401).

Almost surely, 2^18089513 is an apocalyptic number.

18089513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18089513 is a deficient number, since it is larger than the sum of its proper divisors (2537695).

18089513 is a wasteful number, since it uses less digits than its factorization.

18089513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81883.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 18089513 is about 4253.1768126895. The cubic root of 18089513 is about 262.5078479891.

The spelling of 18089513 in words is "eighteen million, eighty-nine thousand, five hundred thirteen".