6491851 has 4 divisors (see below), whose sum is σ = 6501600. Its totient is φ = 6482104.

The previous prime is 6491833. The next prime is 6491857. The reversal of 6491851 is 1581946.

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 6491851 - 2¹¹ = 6489803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6491857) 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, 3796 + ... + 5233.

It is an arithmetic number, because the mean of its divisors is an integer number (1625400).

Almost surely, 2^6491851 is an apocalyptic number.

6491851 is a deficient number, since it is larger than the sum of its proper divisors (9749).

6491851 is an equidigital number, since it uses as much as digits as its factorization.

6491851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9748.

The product of its digits is 8640, while the sum is 34.

The square root of 6491851 is about 2547.9111051997. The cubic root of 6491851 is about 186.5475348841.

It can be divided in two parts, 649 and 1851, that added together give a square (2500 = 50²).

The spelling of 6491851 in words is "six million, four hundred ninety-one thousand, eight hundred fifty-one".