849220581 has 32 divisors (see below), whose sum is σ = 1265061888. Its totient is φ = 502312640.

The previous prime is 849220579. The next prime is 849220591. The reversal of 849220581 is 185022948.

It is a cyclic number.

It is not a de Polignac number, because 849220581 - 2¹ = 849220579 is a prime.

It is a super-2 number, since 2×849220581² = 1442351190387955122, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849220591) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 863416 + ... + 864398.

It is an arithmetic number, because the mean of its divisors is an integer number (39533184).

Almost surely, 2^849220581 is an apocalyptic number.

It is an amenable number.

849220581 is a deficient number, since it is larger than the sum of its proper divisors (415841307).

849220581 is a wasteful number, since it uses less digits than its factorization.

849220581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1601.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 849220581 is about 29141.3894830017. The cubic root of 849220581 is about 946.9786118339.

The spelling of 849220581 in words is "eight hundred forty-nine million, two hundred twenty thousand, five hundred eighty-one".