6816491 has 4 divisors (see below), whose sum is σ = 7436184. Its totient is φ = 6196800.

The previous prime is 6816461. The next prime is 6816493. The reversal of 6816491 is 1946186.

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 6816491 - 2⁶ = 6816427 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (6816493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309830 + ... + 309851.

It is an arithmetic number, because the mean of its divisors is an integer number (1859046).

Almost surely, 2^6816491 is an apocalyptic number.

6816491 is a deficient number, since it is larger than the sum of its proper divisors (619693).

6816491 is a wasteful number, since it uses less digits than its factorization.

6816491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619692.

The product of its digits is 10368, while the sum is 35.

The square root of 6816491 is about 2610.8410522282. The cubic root of 6816491 is about 189.6066747844.

The spelling of 6816491 in words is "six million, eight hundred sixteen thousand, four hundred ninety-one".