849696857 has 2 divisors, whose sum is σ = 849696858. Its totient is φ = 849696856.

The previous prime is 849696847. The next prime is 849696893. The reversal of 849696857 is 758696948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 764854336 + 84842521 = 27656^2 + 9211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-849696857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 849696857.

It is not a weakly prime, because it can be changed into another prime (849696847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424848428 + 424848429.

It is an arithmetic number, because the mean of its divisors is an integer number (424848429).

Almost surely, 2^849696857 is an apocalyptic number.

It is an amenable number.

849696857 is a deficient number, since it is larger than the sum of its proper divisors (1).

849696857 is an equidigital number, since it uses as much as digits as its factorization.

849696857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 62.

The square root of 849696857 is about 29149.5601510555. The cubic root of 849696857 is about 947.1556129196.

Subtracting from 849696857 its reverse (758696948), we obtain a palindrome (90999909).

The spelling of 849696857 in words is "eight hundred forty-nine million, six hundred ninety-six thousand, eight hundred fifty-seven".