805791649 has 16 divisors (see below), whose sum is σ = 897401344. Its totient is φ = 718502400.

The previous prime is 805791631. The next prime is 805791659. The reversal of 805791649 is 946197508.

It is a cyclic number.

It is not a de Polignac number, because 805791649 - 2⁵ = 805791617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805791629) 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 in 15 ways as a sum of consecutive naturals, for example, 269734 + ... + 272704.

It is an arithmetic number, because the mean of its divisors is an integer number (56087584).

Almost surely, 2^805791649 is an apocalyptic number.

It is an amenable number.

805791649 is a deficient number, since it is larger than the sum of its proper divisors (91609695).

805791649 is a wasteful number, since it uses less digits than its factorization.

805791649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3688.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 805791649 is about 28386.4694705065. The cubic root of 805791649 is about 930.5525867726.

It can be divided in two parts, 80579 and 1649, that added together give a palindrome (82228).

The spelling of 805791649 in words is "eight hundred five million, seven hundred ninety-one thousand, six hundred forty-nine".