18125113 has 4 divisors (see below), whose sum is σ = 18422308. Its totient is φ = 17827920.

The previous prime is 18125101. The next prime is 18125131. The reversal of 18125113 is 31152181.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5508409 + 12616704 = 2347^2 + 3552^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18125113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18125413) 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, 148506 + ... + 148627.

It is an arithmetic number, because the mean of its divisors is an integer number (4605577).

Almost surely, 2^18125113 is an apocalyptic number.

It is an amenable number.

18125113 is a deficient number, since it is larger than the sum of its proper divisors (297195).

18125113 is an equidigital number, since it uses as much as digits as its factorization.

18125113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297194.

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

The square root of 18125113 is about 4257.3598626379. The cubic root of 18125113 is about 262.6799395136.

Adding to 18125113 its reverse (31152181), we get a palindrome (49277294).

The spelling of 18125113 in words is "eighteen million, one hundred twenty-five thousand, one hundred thirteen".