31640032443 has 32 divisors (see below), whose sum is σ = 45516556800. Its totient is φ = 19479108096.

The previous prime is 31640032441. The next prime is 31640032471. The reversal of 31640032443 is 34423004613.

It is not a de Polignac number, because 31640032443 - 2¹ = 31640032441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31640032443.

It is not an unprimeable number, because it can be changed into a prime (31640032441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 544948 + ... + 600206.

It is an arithmetic number, because the mean of its divisors is an integer number (1422392400).

Almost surely, 2^31640032443 is an apocalyptic number.

31640032443 is a deficient number, since it is larger than the sum of its proper divisors (13876524357).

31640032443 is a wasteful number, since it uses less digits than its factorization.

31640032443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55491.

The product of its (nonzero) digits is 20736, while the sum is 30.

It can be divided in two parts, 316400 and 32443, that added together give a palindrome (348843).

The spelling of 31640032443 in words is "thirty-one billion, six hundred forty million, thirty-two thousand, four hundred forty-three".