9991308937 has 4 divisors (see below), whose sum is σ = 10020957076. Its totient is φ = 9961660800.

The previous prime is 9991308917. The next prime is 9991309001. The reversal of 9991308937 is 7398031999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4841237241 + 5150071696 = 69579^2 + 71764^2 .

It is a cyclic number.

It is not a de Polignac number, because 9991308937 - 2¹¹ = 9991306889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9991308907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14823564 + ... + 14824237.

It is an arithmetic number, because the mean of its divisors is an integer number (2505239269).

Almost surely, 2^9991308937 is an apocalyptic number.

It is an amenable number.

9991308937 is a deficient number, since it is larger than the sum of its proper divisors (29648139).

9991308937 is a wasteful number, since it uses less digits than its factorization.

9991308937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29648138.

The product of its (nonzero) digits is 3306744, while the sum is 58.

The square root of 9991308937 is about 99956.5352390728. The cubic root of 9991308937 is about 2153.8103648746.

The spelling of 9991308937 in words is "nine billion, nine hundred ninety-one million, three hundred eight thousand, nine hundred thirty-seven".