818994013 has 2 divisors, whose sum is σ = 818994014. Its totient is φ = 818994012.

The previous prime is 818993969. The next prime is 818994019. The reversal of 818994013 is 310499818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 817788409 + 1205604 = 28597^2 + 1098^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-818994013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818994019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409497006 + 409497007.

It is an arithmetic number, because the mean of its divisors is an integer number (409497007).

Almost surely, 2^818994013 is an apocalyptic number.

It is an amenable number.

818994013 is a deficient number, since it is larger than the sum of its proper divisors (1).

818994013 is an equidigital number, since it uses as much as digits as its factorization.

818994013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 818994013 is about 28618.0714409619. The cubic root of 818994013 is about 935.6072439192.

The spelling of 818994013 in words is "eight hundred eighteen million, nine hundred ninety-four thousand, thirteen".