8691491 has 4 divisors (see below), whose sum is σ = 8781192. Its totient is φ = 8601792.

The previous prime is 8691481. The next prime is 8691497. The reversal of 8691491 is 1941968.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8691491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8691497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44705 + ... + 44898.

It is an arithmetic number, because the mean of its divisors is an integer number (2195298).

Almost surely, 2^8691491 is an apocalyptic number.

8691491 is a deficient number, since it is larger than the sum of its proper divisors (89701).

8691491 is an equidigital number, since it uses as much as digits as its factorization.

8691491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89700.

The product of its digits is 15552, while the sum is 38.

The square root of 8691491 is about 2948.1334773039. The cubic root of 8691491 is about 205.6039378469.

The spelling of 8691491 in words is "eight million, six hundred ninety-one thousand, four hundred ninety-one".