6404311631 has 4 divisors (see below), whose sum is σ = 6404796912. Its totient is φ = 6403826352.

The previous prime is 6404311619. The next prime is 6404311651. The reversal of 6404311631 is 1361134046.

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 6404311631 - 2¹⁰ = 6404310607 is a prime.

It is a super-2 number, since 2×6404311631² = 82030414933923760322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6404311594 and 6404311603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6404311651) 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, 222275 + ... + 249428.

It is an arithmetic number, because the mean of its divisors is an integer number (1601199228).

Almost surely, 2^6404311631 is an apocalyptic number.

6404311631 is a deficient number, since it is larger than the sum of its proper divisors (485281).

6404311631 is a wasteful number, since it uses less digits than its factorization.

6404311631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485280.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 6404311631 is about 80026.9431566644. The cubic root of 6404311631 is about 1857.0523735665.

Adding to 6404311631 its reverse (1361134046), we get a palindrome (7765445677).

The spelling of 6404311631 in words is "six billion, four hundred four million, three hundred eleven thousand, six hundred thirty-one".