9991967759 has 2 divisors, whose sum is σ = 9991967760. Its totient is φ = 9991967758.

The previous prime is 9991967731. The next prime is 9991967767. The reversal of 9991967759 is 9577691999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9991967759 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 9991967692 and 9991967701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991967059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995983879 + 4995983880.

It is an arithmetic number, because the mean of its divisors is an integer number (4995983880).

Almost surely, 2^9991967759 is an apocalyptic number.

9991967759 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991967759 is an equidigital number, since it uses as much as digits as its factorization.

9991967759 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86802030, while the sum is 71.

The square root of 9991967759 is about 99959.8307271476. The cubic root of 9991967759 is about 2153.8577042330.

The spelling of 9991967759 in words is "nine billion, nine hundred ninety-one million, nine hundred sixty-seven thousand, seven hundred fifty-nine".