9931889650731 has 8 divisors (see below), whose sum is σ = 13939494246720. Its totient is φ = 6272772410952.

The previous prime is 9931889650723. The next prime is 9931889650733. The reversal of 9931889650731 is 1370569881399.

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

It is not a de Polignac number, because 9931889650731 - 2³ = 9931889650723 is a prime.

It is a super-2 number, since 2×9931889650731² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9931889650733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87121838985 + ... + 87121839098.

It is an arithmetic number, because the mean of its divisors is an integer number (1742436780840).

Almost surely, 2^{9931889650731} is an apocalyptic number.

9931889650731 is a deficient number, since it is larger than the sum of its proper divisors (4007604595989).

9931889650731 is a wasteful number, since it uses less digits than its factorization.

9931889650731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174243678105.

The product of its (nonzero) digits is 88179840, while the sum is 69.

The spelling of 9931889650731 in words is "nine trillion, nine hundred thirty-one billion, eight hundred eighty-nine million, six hundred fifty thousand, seven hundred thirty-one".