9981123193 has 4 divisors (see below), whose sum is σ = 9989352868. Its totient is φ = 9972893520.

The previous prime is 9981123157. The next prime is 9981123197. The reversal of 9981123193 is 3913211899.

9981123193 is digitally balanced in base 3, 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, and also an emirpimes, since its reverse is a distinct semiprime: 3913211899 = 19 ⋅205958521.

It can be written as a sum of positive squares in 2 ways, for example, as 1492817769 + 8488305424 = 38637^2 + 92132^2 .

It is a cyclic number.

It is not a de Polignac number, because 9981123193 - 2²⁹ = 9444252281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9981123197) 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, 4113018 + ... + 4115443.

It is an arithmetic number, because the mean of its divisors is an integer number (2497338217).

Almost surely, 2^9981123193 is an apocalyptic number.

It is an amenable number.

9981123193 is a deficient number, since it is larger than the sum of its proper divisors (8229675).

9981123193 is a wasteful number, since it uses less digits than its factorization.

9981123193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8229674.

The product of its digits is 104976, while the sum is 46.

The square root of 9981123193 is about 99905.5713811797. The cubic root of 9981123193 is about 2153.0782078772.

The spelling of 9981123193 in words is "nine billion, nine hundred eighty-one million, one hundred twenty-three thousand, one hundred ninety-three".