8649491 has 2 divisors, whose sum is σ = 8649492. Its totient is φ = 8649490.

The previous prime is 8649479. The next prime is 8649517. The reversal of 8649491 is 1949468.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8649491 is a prime.

It is a super-3 number, since 3×8649491³ (a number of 22 digits) contains 333 as substring.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (8649451) 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 as a sum of consecutive naturals, namely, 4324745 + 4324746.

It is an arithmetic number, because the mean of its divisors is an integer number (4324746).

Almost surely, 2^8649491 is an apocalyptic number.

8649491 is a deficient number, since it is larger than the sum of its proper divisors (1).

8649491 is an equidigital number, since it uses as much as digits as its factorization.

8649491 is an odious number, because the sum of its binary digits is odd.

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

The square root of 8649491 is about 2941.0017001015. The cubic root of 8649491 is about 205.2722221322.

The spelling of 8649491 in words is "eight million, six hundred forty-nine thousand, four hundred ninety-one".