6431975421 has 8 divisors (see below), whose sum is σ = 8600541600. Its totient is φ = 4275696432.

The previous prime is 6431975371. The next prime is 6431975467. The reversal of 6431975421 is 1245791346.

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

It is not a de Polignac number, because 6431975421 - 2²⁷ = 6297757693 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6431971421) 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, 3070575 + ... + 3072668.

It is an arithmetic number, because the mean of its divisors is an integer number (1075067700).

Almost surely, 2^6431975421 is an apocalyptic number.

It is an amenable number.

6431975421 is a deficient number, since it is larger than the sum of its proper divisors (2168566179).

6431975421 is a wasteful number, since it uses less digits than its factorization.

6431975421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6143595.

The product of its digits is 181440, while the sum is 42.

The square root of 6431975421 is about 80199.5973867700. The cubic root of 6431975421 is about 1859.7224140614.

The spelling of 6431975421 in words is "six billion, four hundred thirty-one million, nine hundred seventy-five thousand, four hundred twenty-one".