18343613 has 2 divisors, whose sum is σ = 18343614. Its totient is φ = 18343612.

The previous prime is 18343609. The next prime is 18343639. The reversal of 18343613 is 31634381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16144324 + 2199289 = 4018^2 + 1483^2 .

It is a cyclic number.

It is not a de Polignac number, because 18343613 - 2² = 18343609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18343693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9171806 + 9171807.

It is an arithmetic number, because the mean of its divisors is an integer number (9171807).

Almost surely, 2^18343613 is an apocalyptic number.

It is an amenable number.

18343613 is a deficient number, since it is larger than the sum of its proper divisors (1).

18343613 is an equidigital number, since it uses as much as digits as its factorization.

18343613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 29.

The square root of 18343613 is about 4282.9444311128. The cubic root of 18343613 is about 263.7312702047.

Adding to 18343613 its reverse (31634381), we get a palindrome (49977994).

The spelling of 18343613 in words is "eighteen million, three hundred forty-three thousand, six hundred thirteen".