849581 has 2 divisors, whose sum is σ = 849582. Its totient is φ = 849580.

The previous prime is 849571. The next prime is 849587. The reversal of 849581 is 185948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 477481 + 372100 = 691^2 + 610^2 .

It is a cyclic number.

It is not a de Polignac number, because 849581 - 2¹⁰ = 848557 is a prime.

It is a super-2 number, since 2×849581² = 1443575751122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (849587) 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, 424790 + 424791.

It is an arithmetic number, because the mean of its divisors is an integer number (424791).

2⁸⁴⁹⁵⁸¹ is an apocalyptic number.

It is an amenable number.

849581 is a deficient number, since it is larger than the sum of its proper divisors (1).

849581 is an equidigital number, since it uses as much as digits as its factorization.

849581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 35.

The square root of 849581 is about 921.7271830645. The cubic root of 849581 is about 94.7112562431.

The spelling of 849581 in words is "eight hundred forty-nine thousand, five hundred eighty-one".