849726561 has 16 divisors (see below), whose sum is σ = 1142676864. Its totient is φ = 561648384.

The previous prime is 849726557. The next prime is 849726611. The reversal of 849726561 is 165627948.

It is not a de Polignac number, because 849726561 - 2² = 849726557 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 849726561.

It is not an unprimeable number, because it can be changed into a prime (849726511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214975 + ... + 218891.

It is an arithmetic number, because the mean of its divisors is an integer number (71417304).

Almost surely, 2^849726561 is an apocalyptic number.

It is an amenable number.

849726561 is a deficient number, since it is larger than the sum of its proper divisors (292950303).

849726561 is a wasteful number, since it uses less digits than its factorization.

849726561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4520.

The product of its digits is 725760, while the sum is 48.

The square root of 849726561 is about 29150.0696568636. The cubic root of 849726561 is about 947.1666497900.

The spelling of 849726561 in words is "eight hundred forty-nine million, seven hundred twenty-six thousand, five hundred sixty-one".