16810813 has 2 divisors, whose sum is σ = 16810814. Its totient is φ = 16810812.

The previous prime is 16810793. The next prime is 16810847. The reversal of 16810813 is 31801861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8982009 + 7828804 = 2997^2 + 2798^2 .

It is a cyclic number.

It is not a de Polignac number, because 16810813 - 2⁹ = 16810301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16810873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8405406 + 8405407.

It is an arithmetic number, because the mean of its divisors is an integer number (8405407).

Almost surely, 2^16810813 is an apocalyptic number.

It is an amenable number.

16810813 is a deficient number, since it is larger than the sum of its proper divisors (1).

16810813 is an equidigital number, since it uses as much as digits as its factorization.

16810813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 16810813 is about 4100.0991451427. The cubic root of 16810813 is about 256.1707692388.

The spelling of 16810813 in words is "sixteen million, eight hundred ten thousand, eight hundred thirteen".