849691 has 2 divisors, whose sum is σ = 849692. Its totient is φ = 849690.

The previous prime is 849649. The next prime is 849701. The reversal of 849691 is 196948.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 849691 - 2⁹ = 849179 is a prime.

849691 is a lucky number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 849691.

It is not a weakly prime, because it can be changed into another prime (849601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424845 + 424846.

It is an arithmetic number, because the mean of its divisors is an integer number (424846).

2⁸⁴⁹⁶⁹¹ is an apocalyptic number.

849691 is a deficient number, since it is larger than the sum of its proper divisors (1).

849691 is an equidigital number, since it uses as much as digits as its factorization.

849691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 37.

The square root of 849691 is about 921.7868517179. The cubic root of 849691 is about 94.7153436652.

It can be divided in two parts, 849 and 691, that added together give a triangular number (1540 = T₅₅).

The spelling of 849691 in words is "eight hundred forty-nine thousand, six hundred ninety-one".