849781657 has 2 divisors, whose sum is σ = 849781658. Its totient is φ = 849781656.

The previous prime is 849781619. The next prime is 849781663. The reversal of 849781657 is 756187948.

849781657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 554319936 + 295461721 = 23544^2 + 17189^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-849781657 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 849781598 and 849781607.

It is not a weakly prime, because it can be changed into another prime (849781157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424890828 + 424890829.

It is an arithmetic number, because the mean of its divisors is an integer number (424890829).

Almost surely, 2^849781657 is an apocalyptic number.

It is an amenable number.

849781657 is a deficient number, since it is larger than the sum of its proper divisors (1).

849781657 is an equidigital number, since it uses as much as digits as its factorization.

849781657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 55.

The square root of 849781657 is about 29151.0146821684. The cubic root of 849781657 is about 947.1871206757.

The spelling of 849781657 in words is "eight hundred forty-nine million, seven hundred eighty-one thousand, six hundred fifty-seven".