31644880013 has 4 divisors (see below), whose sum is σ = 31650939360. Its totient is φ = 31638820668.

The previous prime is 31644880009. The next prime is 31644880031. The reversal of 31644880013 is 31008844613.

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.

It is a cyclic number.

It is not a de Polignac number, because 31644880013 - 2² = 31644880009 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 (31644880213) 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, 3021833 + ... + 3032286.

It is an arithmetic number, because the mean of its divisors is an integer number (7912734840).

Almost surely, 2^31644880013 is an apocalyptic number.

It is an amenable number.

31644880013 is a deficient number, since it is larger than the sum of its proper divisors (6059347).

31644880013 is an equidigital number, since it uses as much as digits as its factorization.

31644880013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6059346.

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 31644880013 in words is "thirty-one billion, six hundred forty-four million, eight hundred eighty thousand, thirteen".