6491043191 has 8 divisors (see below), whose sum is σ = 6563364864. Its totient is φ = 6419107800.

The previous prime is 6491043133. The next prime is 6491043193. The reversal of 6491043191 is 1913401946.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6491043191 is a prime.

It is a super-3 number, since 3×6491043191³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6491043193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62711 + ... + 130056.

It is an arithmetic number, because the mean of its divisors is an integer number (820420608).

Almost surely, 2^6491043191 is an apocalyptic number.

6491043191 is a deficient number, since it is larger than the sum of its proper divisors (72321673).

6491043191 is a wasteful number, since it uses less digits than its factorization.

6491043191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193141.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 6491043191 is about 80567.0105626366. The cubic root of 6491043191 is about 1865.3979692519.

The spelling of 6491043191 in words is "six billion, four hundred ninety-one million, forty-three thousand, one hundred ninety-one".