18085213 has 2 divisors, whose sum is σ = 18085214. Its totient is φ = 18085212.

The previous prime is 18085189. The next prime is 18085237. The reversal of 18085213 is 31258081.

It is a balanced prime because it is at equal distance from previous prime (18085189) and next prime (18085237).

It can be written as a sum of positive squares in only one way, i.e., 15657849 + 2427364 = 3957^2 + 1558^2 .

It is a cyclic number.

It is not a de Polignac number, because 18085213 - 2¹³ = 18077021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18085273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9042606 + 9042607.

It is an arithmetic number, because the mean of its divisors is an integer number (9042607).

Almost surely, 2^18085213 is an apocalyptic number.

It is an amenable number.

18085213 is a deficient number, since it is larger than the sum of its proper divisors (1).

18085213 is an equidigital number, since it uses as much as digits as its factorization.

18085213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18085213 is about 4252.6712781498. The cubic root of 18085213 is about 262.4870463751.

It can be divided in two parts, 1808 and 5213, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 18085213 in words is "eighteen million, eighty-five thousand, two hundred thirteen".