18958613 has 2 divisors, whose sum is σ = 18958614. Its totient is φ = 18958612.

The previous prime is 18958603. The next prime is 18958619. The reversal of 18958613 is 31685981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18472804 + 485809 = 4298^2 + 697^2 .

It is an emirp because it is prime and its reverse (31685981) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18958613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18958619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9479306 + 9479307.

It is an arithmetic number, because the mean of its divisors is an integer number (9479307).

Almost surely, 2^18958613 is an apocalyptic number.

It is an amenable number.

18958613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18958613 is an equidigital number, since it uses as much as digits as its factorization.

18958613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 41.

The square root of 18958613 is about 4354.1489409528. The cubic root of 18958613 is about 266.6462746559.

The spelling of 18958613 in words is "eighteen million, nine hundred fifty-eight thousand, six hundred thirteen".