8109491 has 16 divisors (see below), whose sum is σ = 9055200. Its totient is φ = 7216128.

The previous prime is 8109481. The next prime is 8109503. The reversal of 8109491 is 1949018.

It is a cyclic number.

It is not a de Polignac number, because 8109491 - 2²² = 3915187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8109421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74345 + ... + 74453.

It is an arithmetic number, because the mean of its divisors is an integer number (565950).

Almost surely, 2^8109491 is an apocalyptic number.

8109491 is a deficient number, since it is larger than the sum of its proper divisors (945709).

8109491 is a wasteful number, since it uses less digits than its factorization.

8109491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 8109491 is about 2847.7168047402. The cubic root of 8109491 is about 200.9082937677.

It can be divided in two parts, 810 and 9491, that added together give a palindrome (10301).

The spelling of 8109491 in words is "eight million, one hundred nine thousand, four hundred ninety-one".