836807681 has 2 divisors, whose sum is σ = 836807682. Its totient is φ = 836807680.

The previous prime is 836807669. The next prime is 836807729. The reversal of 836807681 is 186708638.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 738480625 + 98327056 = 27175^2 + 9916^2 .

It is a cyclic number.

It is not a de Polignac number, because 836807681 - 2²² = 832613377 is a prime.

It is a super-2 number, since 2×836807681² = 1400494189961195522, which contains 22 as substring.

It is a Chen prime.

It is equal to p_42939956 and since 836807681 and 42939956 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (836807641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 418403840 + 418403841.

It is an arithmetic number, because the mean of its divisors is an integer number (418403841).

Almost surely, 2^836807681 is an apocalyptic number.

It is an amenable number.

836807681 is a deficient number, since it is larger than the sum of its proper divisors (1).

836807681 is an equidigital number, since it uses as much as digits as its factorization.

836807681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 836807681 is about 28927.6283334808. The cubic root of 836807681 is about 942.3420101184.

The spelling of 836807681 in words is "eight hundred thirty-six million, eight hundred seven thousand, six hundred eighty-one".