6491399 has 8 divisors (see below), whose sum is σ = 6897168. Its totient is φ = 6088320.

The previous prime is 6491377. The next prime is 6491411. The reversal of 6491399 is 9931946.

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 6491399 - 2¹⁶ = 6425863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491299) 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, 6704 + ... + 7610.

It is an arithmetic number, because the mean of its divisors is an integer number (862146).

Almost surely, 2^6491399 is an apocalyptic number.

6491399 is a deficient number, since it is larger than the sum of its proper divisors (405769).

6491399 is a wasteful number, since it uses less digits than its factorization.

6491399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345.

The product of its digits is 52488, while the sum is 41.

The square root of 6491399 is about 2547.8224035439. The cubic root of 6491399 is about 186.5432052795.

It can be divided in two parts, 649 and 1399, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 6491399 in words is "six million, four hundred ninety-one thousand, three hundred ninety-nine".