18012613 has 2 divisors, whose sum is σ = 18012614. Its totient is φ = 18012612.

The previous prime is 18012583. The next prime is 18012647. The reversal of 18012613 is 31621081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9351364 + 8661249 = 3058^2 + 2943^2 .

It is an emirp because it is prime and its reverse (31621081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18012613 - 2¹⁷ = 17881541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18012413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9006306 + 9006307.

It is an arithmetic number, because the mean of its divisors is an integer number (9006307).

Almost surely, 2^18012613 is an apocalyptic number.

It is an amenable number.

18012613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18012613 is an equidigital number, since it uses as much as digits as its factorization.

18012613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 18012613 is about 4244.1268831174. The cubic root of 18012613 is about 262.1353388530.

Adding to 18012613 its reverse (31621081), we get a palindrome (49633694).

The spelling of 18012613 in words is "eighteen million, twelve thousand, six hundred thirteen".