991019759 has 2 divisors, whose sum is σ = 991019760. Its totient is φ = 991019758.

The previous prime is 991019747. The next prime is 991019767. The reversal of 991019759 is 957910199.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991019759 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991019719) 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 as a sum of consecutive naturals, namely, 495509879 + 495509880.

It is an arithmetic number, because the mean of its divisors is an integer number (495509880).

Almost surely, 2^991019759 is an apocalyptic number.

991019759 is a deficient number, since it is larger than the sum of its proper divisors (1).

991019759 is an equidigital number, since it uses as much as digits as its factorization.

991019759 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 229635, while the sum is 50.

The square root of 991019759 is about 31480.4663084904. The cubic root of 991019759 is about 996.9975808343.

The spelling of 991019759 in words is "nine hundred ninety-one million, nineteen thousand, seven hundred fifty-nine".