9988242191 has 4 divisors (see below), whose sum is σ = 10310443584. Its totient is φ = 9666040800.

The previous prime is 9988242139. The next prime is 9988242211. The reversal of 9988242191 is 1912428899.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1912428899 = 1367 ⋅1398997.

It is a cyclic number.

It is not a de Polignac number, because 9988242191 - 2⁶ = 9988242127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9988242491) 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, 161100650 + ... + 161100711.

It is an arithmetic number, because the mean of its divisors is an integer number (2577610896).

Almost surely, 2^9988242191 is an apocalyptic number.

9988242191 is a deficient number, since it is larger than the sum of its proper divisors (322201393).

9988242191 is a wasteful number, since it uses less digits than its factorization.

9988242191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322201392.

The product of its digits is 746496, while the sum is 53.

The square root of 9988242191 is about 99941.1936640743. The cubic root of 9988242191 is about 2153.5899778269.

The spelling of 9988242191 in words is "nine billion, nine hundred eighty-eight million, two hundred forty-two thousand, one hundred ninety-one".