6491428271 has 4 divisors (see below), whose sum is σ = 6494523000. Its totient is φ = 6488333544.

The previous prime is 6491428211. The next prime is 6491428301. The reversal of 6491428271 is 1728241946.

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 6491428271 - 2¹⁰ = 6491427247 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 (6491428201) 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 3 ways as a sum of consecutive naturals, for example, 1544216 + ... + 1548413.

It is an arithmetic number, because the mean of its divisors is an integer number (1623630750).

Almost surely, 2^6491428271 is an apocalyptic number.

6491428271 is a deficient number, since it is larger than the sum of its proper divisors (3094729).

6491428271 is a wasteful number, since it uses less digits than its factorization.

6491428271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3094728.

The product of its digits is 193536, while the sum is 44.

The square root of 6491428271 is about 80569.4003390866. The cubic root of 6491428271 is about 1865.4348566584.

The spelling of 6491428271 in words is "six billion, four hundred ninety-one million, four hundred twenty-eight thousand, two hundred seventy-one".