18670013 has 2 divisors, whose sum is σ = 18670014. Its totient is φ = 18670012.

The previous prime is 18670009. The next prime is 18670021. The reversal of 18670013 is 31007681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14455204 + 4214809 = 3802^2 + 2053^2 .

It is an emirp because it is prime and its reverse (31007681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18670013 - 2² = 18670009 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18670033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9335006 + 9335007.

It is an arithmetic number, because the mean of its divisors is an integer number (9335007).

Almost surely, 2^18670013 is an apocalyptic number.

It is an amenable number.

18670013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18670013 is an equidigital number, since it uses as much as digits as its factorization.

18670013 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 18670013 is about 4320.8810444168. The cubic root of 18670013 is about 265.2863310695.

Adding to 18670013 its reverse (31007681), we get a palindrome (49677694).

The spelling of 18670013 in words is "eighteen million, six hundred seventy thousand, thirteen".