9797887979 has 4 divisors (see below), whose sum is σ = 10688605080. Its totient is φ = 8907170880.

The previous prime is 9797887943. The next prime is 9797887997.

9797887979 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9797887979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9797887579) 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, 445358534 + ... + 445358555.

It is an arithmetic number, because the mean of its divisors is an integer number (2672151270).

Almost surely, 2^9797887979 is an apocalyptic number.

9797887979 is a deficient number, since it is larger than the sum of its proper divisors (890717101).

9797887979 is a wasteful number, since it uses less digits than its factorization.

9797887979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890717100.

The product of its digits is 1008189504, while the sum is 80.

The square root of 9797887979 is about 98984.2814743836. The cubic root of 9797887979 is about 2139.8212197432.

The spelling of 9797887979 in words is "nine billion, seven hundred ninety-seven million, eight hundred eighty-seven thousand, nine hundred seventy-nine".