18115085 has 4 divisors (see below), whose sum is σ = 21738108. Its totient is φ = 14492064.

The previous prime is 18115079. The next prime is 18115091. The reversal of 18115085 is 58051181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58051181 = 271 ⋅214211.

It is an interprime number because it is at equal distance from previous prime (18115079) and next prime (18115091).

It can be written as a sum of positive squares in 2 ways, for example, as 13734436 + 4380649 = 3706^2 + 2093^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18115085 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1811504 + ... + 1811513.

It is an arithmetic number, because the mean of its divisors is an integer number (5434527).

Almost surely, 2^18115085 is an apocalyptic number.

It is an amenable number.

18115085 is a deficient number, since it is larger than the sum of its proper divisors (3623023).

18115085 is an equidigital number, since it uses as much as digits as its factorization.

18115085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3623022.

The product of its (nonzero) digits is 1600, while the sum is 29.

The square root of 18115085 is about 4256.1819744931. The cubic root of 18115085 is about 262.6314866593.

The spelling of 18115085 in words is "eighteen million, one hundred fifteen thousand, eighty-five".