31928639491 has 8 divisors (see below), whose sum is σ = 38076390144. Its totient is φ = 26177517960.

The previous prime is 31928639467. The next prime is 31928639497. The reversal of 31928639491 is 19493682913.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31928639491 - 2¹³ = 31928631299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31928639497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99157105 + ... + 99157426.

It is an arithmetic number, because the mean of its divisors is an integer number (4759548768).

Almost surely, 2^31928639491 is an apocalyptic number.

31928639491 is a deficient number, since it is larger than the sum of its proper divisors (6147750653).

31928639491 is a wasteful number, since it uses less digits than its factorization.

31928639491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198314561.

The product of its digits is 2519424, while the sum is 55.

The spelling of 31928639491 in words is "thirty-one billion, nine hundred twenty-eight million, six hundred thirty-nine thousand, four hundred ninety-one".