816943013 has 2 divisors, whose sum is σ = 816943014. Its totient is φ = 816943012.

The previous prime is 816943009. The next prime is 816943033. The reversal of 816943013 is 310349618.

816943013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 537451489 + 279491524 = 23183^2 + 16718^2 .

It is a cyclic number.

It is not a de Polignac number, because 816943013 - 2² = 816943009 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816943033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408471506 + 408471507.

It is an arithmetic number, because the mean of its divisors is an integer number (408471507).

Almost surely, 2^816943013 is an apocalyptic number.

It is an amenable number.

816943013 is a deficient number, since it is larger than the sum of its proper divisors (1).

816943013 is an equidigital number, since it uses as much as digits as its factorization.

816943013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 816943013 is about 28582.2149771497. The cubic root of 816943013 is about 934.8255798643.

The spelling of 816943013 in words is "eight hundred sixteen million, nine hundred forty-three thousand, thirteen".