819802013 has 2 divisors, whose sum is σ = 819802014. Its totient is φ = 819802012.

The previous prime is 819802001. The next prime is 819802019. The reversal of 819802013 is 310208918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 653211364 + 166590649 = 25558^2 + 12907^2 .

It is a cyclic number.

It is not a de Polignac number, because 819802013 - 2⁸ = 819801757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819802019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409901006 + 409901007.

It is an arithmetic number, because the mean of its divisors is an integer number (409901007).

Almost surely, 2^819802013 is an apocalyptic number.

It is an amenable number.

819802013 is a deficient number, since it is larger than the sum of its proper divisors (1).

819802013 is an equidigital number, since it uses as much as digits as its factorization.

819802013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 819802013 is about 28632.1849148821. The cubic root of 819802013 is about 935.9148254032.

The spelling of 819802013 in words is "eight hundred nineteen million, eight hundred two thousand, thirteen".