18700613 has 2 divisors, whose sum is σ = 18700614. Its totient is φ = 18700612.

The previous prime is 18700607. The next prime is 18700631. The reversal of 18700613 is 31600781.

Together with next prime (18700631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17581249 + 1119364 = 4193^2 + 1058^2 .

It is a cyclic number.

It is not a de Polignac number, because 18700613 - 2¹⁰ = 18699589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18700673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9350306 + 9350307.

It is an arithmetic number, because the mean of its divisors is an integer number (9350307).

Almost surely, 2^18700613 is an apocalyptic number.

18700613 is the 2312-nd centered heptagonal number.

It is an amenable number.

18700613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18700613 is an equidigital number, since it uses as much as digits as its factorization.

18700613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 18700613 is about 4324.4205392168. The cubic root of 18700613 is about 265.4311860085.

The spelling of 18700613 in words is "eighteen million, seven hundred thousand, six hundred thirteen".