9973768891 has 4 divisors (see below), whose sum is σ = 10085833800. Its totient is φ = 9861703984.

The previous prime is 9973768873. The next prime is 9973768897. The reversal of 9973768891 is 1988673799.

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 9973768891 - 2²³ = 9965380283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9973768897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56032321 + ... + 56032498.

It is an arithmetic number, because the mean of its divisors is an integer number (2521458450).

Almost surely, 2^9973768891 is an apocalyptic number.

9973768891 is a deficient number, since it is larger than the sum of its proper divisors (112064909).

9973768891 is a wasteful number, since it uses less digits than its factorization.

9973768891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112064908.

The product of its digits is 41150592, while the sum is 67.

The square root of 9973768891 is about 99868.7583331244. The cubic root of 9973768891 is about 2152.5492668053.

The spelling of 9973768891 in words is "nine billion, nine hundred seventy-three million, seven hundred sixty-eight thousand, eight hundred ninety-one".