6391878281431 has 8 divisors (see below), whose sum is σ = 6416562653280. Its totient is φ = 6367200745248.

The previous prime is 6391878281423. The next prime is 6391878281447. The reversal of 6391878281431 is 1341828781936.

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

It is a cyclic number.

It is not a de Polignac number, because 6391878281431 - 2³ = 6391878281423 is a prime.

It is a super-2 number, since 2×6391878281431² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6391878281431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6391878281471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168825 + ... + 3579421.

It is an arithmetic number, because the mean of its divisors is an integer number (802070331660).

Almost surely, 2^{6391878281431} is an apocalyptic number.

6391878281431 is a deficient number, since it is larger than the sum of its proper divisors (24684371849).

6391878281431 is a wasteful number, since it uses less digits than its factorization.

6391878281431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3417833.

The product of its digits is 13934592, while the sum is 61.

The spelling of 6391878281431 in words is "six trillion, three hundred ninety-one billion, eight hundred seventy-eight million, two hundred eighty-one thousand, four hundred thirty-one".