849725689 has 2 divisors, whose sum is σ = 849725690. Its totient is φ = 849725688.

The previous prime is 849725629. The next prime is 849725713. The reversal of 849725689 is 986527948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 807696400 + 42029289 = 28420^2 + 6483^2 .

It is a cyclic number.

It is not a de Polignac number, because 849725689 - 2⁷ = 849725561 is a prime.

It is not a weakly prime, because it can be changed into another prime (849725629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424862844 + 424862845.

It is an arithmetic number, because the mean of its divisors is an integer number (424862845).

Almost surely, 2^849725689 is an apocalyptic number.

It is an amenable number.

849725689 is a deficient number, since it is larger than the sum of its proper divisors (1).

849725689 is an equidigital number, since it uses as much as digits as its factorization.

849725689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8709120, while the sum is 58.

The square root of 849725689 is about 29150.0546997772. The cubic root of 849725689 is about 947.1663257919.

The spelling of 849725689 in words is "eight hundred forty-nine million, seven hundred twenty-five thousand, six hundred eighty-nine".