991712339 has 2 divisors, whose sum is σ = 991712340. Its totient is φ = 991712338.

The previous prime is 991712317. The next prime is 991712363. The reversal of 991712339 is 933217199.

991712339 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (933217199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 991712339 - 2⁸ = 991712083 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 991712339.

It is not a weakly prime, because it can be changed into another prime (991712399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495856169 + 495856170.

It is an arithmetic number, because the mean of its divisors is an integer number (495856170).

Almost surely, 2^991712339 is an apocalyptic number.

991712339 is a deficient number, since it is larger than the sum of its proper divisors (1).

991712339 is an equidigital number, since it uses as much as digits as its factorization.

991712339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 44.

The square root of 991712339 is about 31491.4645419993. The cubic root of 991712339 is about 997.2297792969.

The spelling of 991712339 in words is "nine hundred ninety-one million, seven hundred twelve thousand, three hundred thirty-nine".