8491649 has 4 divisors (see below), whose sum is σ = 8552880. Its totient is φ = 8430420.

The previous prime is 8491643. The next prime is 8491663. The reversal of 8491649 is 9461948.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8491649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8491643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30407 + ... + 30684.

It is an arithmetic number, because the mean of its divisors is an integer number (2138220).

Almost surely, 2^8491649 is an apocalyptic number.

It is an amenable number.

8491649 is a deficient number, since it is larger than the sum of its proper divisors (61231).

8491649 is a wasteful number, since it uses less digits than its factorization.

8491649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61230.

The product of its digits is 62208, while the sum is 41.

The square root of 8491649 is about 2914.0434107954. The cubic root of 8491649 is about 204.0158980946.

Subtracting 8491649 from its reverse (9461948), we obtain a cube (970299 = 99³).

The spelling of 8491649 in words is "eight million, four hundred ninety-one thousand, six hundred forty-nine".