31644644613 has 16 divisors (see below), whose sum is σ = 42746874816. Its totient is φ = 20820758400.

The previous prime is 31644644587. The next prime is 31644644623.

It is a happy number.

31644644613 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31644644613 - 2³² = 27349677317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31644644623) 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 15 ways as a sum of consecutive naturals, for example, 71995 + ... + 261672.

It is an arithmetic number, because the mean of its divisors is an integer number (2671679676).

Almost surely, 2^31644644613 is an apocalyptic number.

It is an amenable number.

31644644613 is a deficient number, since it is larger than the sum of its proper divisors (11102230203).

31644644613 is a wasteful number, since it uses less digits than its factorization.

31644644613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334084.

The product of its digits is 497664, while the sum is 42.

The spelling of 31644644613 in words is "thirty-one billion, six hundred forty-four million, six hundred forty-four thousand, six hundred thirteen".