806559749 has 4 divisors (see below), whose sum is σ = 826231980. Its totient is φ = 786887520.

The previous prime is 806559737. The next prime is 806559763. The reversal of 806559749 is 947955608.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 195580225 + 610979524 = 13985^2 + 24718^2 .

It is a cyclic number.

It is not a de Polignac number, because 806559749 - 2⁸ = 806559493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 806559749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806529749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9836054 + ... + 9836135.

It is an arithmetic number, because the mean of its divisors is an integer number (206557995).

Almost surely, 2^806559749 is an apocalyptic number.

It is an amenable number.

806559749 is a deficient number, since it is larger than the sum of its proper divisors (19672231).

806559749 is a wasteful number, since it uses less digits than its factorization.

806559749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19672230.

The product of its (nonzero) digits is 2721600, while the sum is 53.

The square root of 806559749 is about 28399.9955809856. The cubic root of 806559749 is about 930.8481679173.

The spelling of 806559749 in words is "eight hundred six million, five hundred fifty-nine thousand, seven hundred forty-nine".