6398844631 has 4 divisors (see below), whose sum is σ = 6401501064. Its totient is φ = 6396188200.

The previous prime is 6398844629. The next prime is 6398844649. The reversal of 6398844631 is 1364488936.

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 6398844631 - 2¹ = 6398844629 is a prime.

It is a super-2 number, since 2×6398844631² = 81890425223355052322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6398844611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1324600 + ... + 1329421.

It is an arithmetic number, because the mean of its divisors is an integer number (1600375266).

Almost surely, 2^6398844631 is an apocalyptic number.

6398844631 is a deficient number, since it is larger than the sum of its proper divisors (2656433).

6398844631 is a wasteful number, since it uses less digits than its factorization.

6398844631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2656432.

The product of its digits is 2985984, while the sum is 52.

The square root of 6398844631 is about 79992.7786178227. The cubic root of 6398844631 is about 1856.5238028079.

The spelling of 6398844631 in words is "six billion, three hundred ninety-eight million, eight hundred forty-four thousand, six hundred thirty-one".