9791881979 has 4 divisors (see below), whose sum is σ = 10682053080. Its totient is φ = 8901710880.

The previous prime is 9791881943. The next prime is 9791881997.

9791881979 is nontrivially palindromic in base 10.

9791881979 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 not a de Polignac number, because 9791881979 - 2²⁸ = 9523446523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9791881279) 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, 445085534 + ... + 445085555.

It is an arithmetic number, because the mean of its divisors is an integer number (2670513270).

Almost surely, 2^9791881979 is an apocalyptic number.

9791881979 is a deficient number, since it is larger than the sum of its proper divisors (890171101).

9791881979 is a wasteful number, since it uses less digits than its factorization.

9791881979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890171100.

The product of its digits is 20575296, while the sum is 68.

The square root of 9791881979 is about 98953.9386735061. The cubic root of 9791881979 is about 2139.3839012392.

The spelling of 9791881979 in words is "nine billion, seven hundred ninety-one million, eight hundred eighty-one thousand, nine hundred seventy-nine".