6516991 has 8 divisors (see below), whose sum is σ = 7190064. Its totient is φ = 5868480.

The previous prime is 6516989. The next prime is 6516997. The reversal of 6516991 is 1996156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6516991 - 2¹ = 6516989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6516991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6516997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5581 + ... + 6646.

It is an arithmetic number, because the mean of its divisors is an integer number (898758).

Almost surely, 2^6516991 is an apocalyptic number.

6516991 is a deficient number, since it is larger than the sum of its proper divisors (673073).

6516991 is a wasteful number, since it uses less digits than its factorization.

6516991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12281.

The product of its digits is 14580, while the sum is 37.

The square root of 6516991 is about 2552.8397912913. The cubic root of 6516991 is about 186.7880294255.

The spelling of 6516991 in words is "six million, five hundred sixteen thousand, nine hundred ninety-one".