18000613 has 2 divisors, whose sum is σ = 18000614. Its totient is φ = 18000612.

The previous prime is 18000601. The next prime is 18000623. The reversal of 18000613 is 31600081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9345249 + 8655364 = 3057^2 + 2942^2 .

It is a cyclic number.

It is not a de Polignac number, because 18000613 - 2¹³ = 17992421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18000623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000306 + 9000307.

It is an arithmetic number, because the mean of its divisors is an integer number (9000307).

Almost surely, 2^18000613 is an apocalyptic number.

It is an amenable number.

18000613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000613 is an equidigital number, since it uses as much as digits as its factorization.

18000613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 18000613 is about 4242.7129292470. The cubic root of 18000613 is about 262.0771144139.

Adding to 18000613 its reverse (31600081), we get a palindrome (49600694).

The spelling of 18000613 in words is "eighteen million, six hundred thirteen", and thus it is an aban number.