817881349 has 2 divisors, whose sum is σ = 817881350. Its totient is φ = 817881348.

The previous prime is 817881347. The next prime is 817881359. The reversal of 817881349 is 943188718.

817881349 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., 816930724 + 950625 = 28582^2 + 975^2 .

It is a cyclic number.

It is not a de Polignac number, because 817881349 - 2¹ = 817881347 is a prime.

Together with 817881347, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (817881343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408940674 + 408940675.

It is an arithmetic number, because the mean of its divisors is an integer number (408940675).

Almost surely, 2^817881349 is an apocalyptic number.

It is an amenable number.

817881349 is a deficient number, since it is larger than the sum of its proper divisors (1).

817881349 is an equidigital number, since it uses as much as digits as its factorization.

817881349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 49.

The square root of 817881349 is about 28598.6249494622. The cubic root of 817881349 is about 935.1833546637.

The spelling of 817881349 in words is "eight hundred seventeen million, eight hundred eighty-one thousand, three hundred forty-nine".