8091729 has 12 divisors (see below), whose sum is σ = 11757876. Its totient is φ = 5362272.

The previous prime is 8091703. The next prime is 8091731. The reversal of 8091729 is 9271908.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5760000 + 2331729 = 2400^2 + 1527^2 .

It is not a de Polignac number, because 8091729 - 2¹¹ = 8089681 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 8091693 and 8091702.

It is not an unprimeable number, because it can be changed into a prime (8091529) 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 11 ways as a sum of consecutive naturals, for example, 1042 + ... + 4155.

It is an arithmetic number, because the mean of its divisors is an integer number (979823).

Almost surely, 2^8091729 is an apocalyptic number.

It is an amenable number.

8091729 is a deficient number, since it is larger than the sum of its proper divisors (3666147).

8091729 is a wasteful number, since it uses less digits than its factorization.

8091729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5376 (or 5373 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 8091729 is about 2844.5964564416. The cubic root of 8091729 is about 200.7615052026.

It can be divided in two parts, 80 and 91729, that added together give a square (91809 = 303²).

The spelling of 8091729 in words is "eight million, ninety-one thousand, seven hundred twenty-nine".