816640837 has 2 divisors, whose sum is σ = 816640838. Its totient is φ = 816640836.

The previous prime is 816640817. The next prime is 816640859. The reversal of 816640837 is 738046618.

816640837 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., 815730721 + 910116 = 28561^2 + 954^2 .

It is a cyclic number.

It is not a de Polignac number, because 816640837 - 2⁷ = 816640709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 816640793 and 816640802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816640817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408320418 + 408320419.

It is an arithmetic number, because the mean of its divisors is an integer number (408320419).

Almost surely, 2^816640837 is an apocalyptic number.

It is an amenable number.

816640837 is a deficient number, since it is larger than the sum of its proper divisors (1).

816640837 is an equidigital number, since it uses as much as digits as its factorization.

816640837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 816640837 is about 28576.9284038715. The cubic root of 816640837 is about 934.7103059362.

The spelling of 816640837 in words is "eight hundred sixteen million, six hundred forty thousand, eight hundred thirty-seven".