6480991 has 4 divisors (see below), whose sum is σ = 7070184. Its totient is φ = 5891800.

The previous prime is 6480989. The next prime is 6480997. The reversal of 6480991 is 1990846.

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

It is a cyclic number.

It is not a de Polignac number, because 6480991 - 2¹ = 6480989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6480991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6480997) 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 3 ways as a sum of consecutive naturals, for example, 294580 + ... + 294601.

It is an arithmetic number, because the mean of its divisors is an integer number (1767546).

Almost surely, 2^6480991 is an apocalyptic number.

6480991 is a deficient number, since it is larger than the sum of its proper divisors (589193).

6480991 is a wasteful number, since it uses less digits than its factorization.

6480991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589192.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 6480991 is about 2545.7790556134. The cubic root of 6480991 is about 186.4434537846.

The spelling of 6480991 in words is "six million, four hundred eighty thousand, nine hundred ninety-one".