9997889999 has 2 divisors, whose sum is σ = 9997890000. Its totient is φ = 9997889998.

The previous prime is 9997889959. The next prime is 9997890029. The reversal of 9997889999 is 9999887999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9997889999 - 2²⁴ = 9981112783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9997889999.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9997889959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998944999 + 4998945000.

It is an arithmetic number, because the mean of its divisors is an integer number (4998945000).

Almost surely, 2^9997889999 is an apocalyptic number.

9997889999 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997889999 is an equidigital number, since it uses as much as digits as its factorization.

9997889999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2142770112, while the sum is 86.

The square root of 9997889999 is about 99989.4494384283. The cubic root of 9997889999 is about 2154.2831507281.

The spelling of 9997889999 in words is "nine billion, nine hundred ninety-seven million, eight hundred eighty-nine thousand, nine hundred ninety-nine".