6431884421 has 4 divisors (see below), whose sum is σ = 6433074144. Its totient is φ = 6430694700.

The previous prime is 6431884409. The next prime is 6431884429. The reversal of 6431884421 is 1244881346.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1244881346 = 2 ⋅622440673.

It is a cyclic number.

It is not a de Polignac number, because 6431884421 - 2¹⁸ = 6431622277 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 (6431884429) 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, 586715 + ... + 597576.

It is an arithmetic number, because the mean of its divisors is an integer number (1608268536).

Almost surely, 2^6431884421 is an apocalyptic number.

It is an amenable number.

6431884421 is a deficient number, since it is larger than the sum of its proper divisors (1189723).

6431884421 is a wasteful number, since it uses less digits than its factorization.

6431884421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189722.

The product of its digits is 147456, while the sum is 41.

The square root of 6431884421 is about 80199.0300502444. The cubic root of 6431884421 is about 1859.7136435294.

The spelling of 6431884421 in words is "six billion, four hundred thirty-one million, eight hundred eighty-four thousand, four hundred twenty-one".