9943249691 has 4 divisors (see below), whose sum is σ = 10286120400. Its totient is φ = 9600378984.

The previous prime is 9943249681. The next prime is 9943249711. The reversal of 9943249691 is 1969423499.

9943249691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9943249691 is a prime.

It is a pancake number, because a pancake can be divided into 9943249691 parts by 141019 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9943249621) 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 3 ways as a sum of consecutive naturals, for example, 171435311 + ... + 171435368.

It is an arithmetic number, because the mean of its divisors is an integer number (2571530100).

Almost surely, 2^9943249691 is an apocalyptic number.

9943249691 is a deficient number, since it is larger than the sum of its proper divisors (342870709).

9943249691 is a wasteful number, since it uses less digits than its factorization.

9943249691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342870708.

The product of its digits is 3779136, while the sum is 56.

The square root of 9943249691 is about 99715.8447339238. The cubic root of 9943249691 is about 2150.3514616347.

The spelling of 9943249691 in words is "nine billion, nine hundred forty-three million, two hundred forty-nine thousand, six hundred ninety-one".