6391127489 has 4 divisors (see below), whose sum is σ = 6727502640. Its totient is φ = 6054752340.

The previous prime is 6391127419. The next prime is 6391127497. The reversal of 6391127489 is 9847211936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6391127489 - 2⁸ = 6391127233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6391127419) 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, 168187547 + ... + 168187584.

It is an arithmetic number, because the mean of its divisors is an integer number (1681875660).

Almost surely, 2^6391127489 is an apocalyptic number.

It is an amenable number.

6391127489 is a deficient number, since it is larger than the sum of its proper divisors (336375151).

6391127489 is a wasteful number, since it uses less digits than its factorization.

6391127489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336375150.

The product of its digits is 653184, while the sum is 50.

The square root of 6391127489 is about 79944.5275738121. The cubic root of 6391127489 is about 1855.7771669135. Note that the first 3 decimals are identical.

The spelling of 6391127489 in words is "six billion, three hundred ninety-one million, one hundred twenty-seven thousand, four hundred eighty-nine".