9911812839 has 4 divisors (see below), whose sum is σ = 13215750456. Its totient is φ = 6607875224.

The previous prime is 9911812837. The next prime is 9911812849. The reversal of 9911812839 is 9382181199.

9911812839 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, and also an emirpimes, since its reverse is a distinct semiprime: 9382181199 = 3 ⋅3127393733.

It is a cyclic number.

It is not a de Polignac number, because 9911812839 - 2¹ = 9911812837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9911812791 and 9911812800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9911812831) 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, 1651968804 + ... + 1651968809.

It is an arithmetic number, because the mean of its divisors is an integer number (3303937614).

Almost surely, 2^9911812839 is an apocalyptic number.

9911812839 is a deficient number, since it is larger than the sum of its proper divisors (3303937617).

9911812839 is a wasteful number, since it uses less digits than its factorization.

9911812839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3303937616.

The product of its digits is 279936, while the sum is 51.

The square root of 9911812839 is about 99558.0877628734. The cubic root of 9911812839 is about 2148.0828656708.

The spelling of 9911812839 in words is "nine billion, nine hundred eleven million, eight hundred twelve thousand, eight hundred thirty-nine".