991326199 has 2 divisors, whose sum is σ = 991326200. Its totient is φ = 991326198.

The previous prime is 991326191. The next prime is 991326223. The reversal of 991326199 is 991623199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 991326199 - 2³ = 991326191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991326191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495663099 + 495663100.

It is an arithmetic number, because the mean of its divisors is an integer number (495663100).

Almost surely, 2^991326199 is an apocalyptic number.

991326199 is a deficient number, since it is larger than the sum of its proper divisors (1).

991326199 is an equidigital number, since it uses as much as digits as its factorization.

991326199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 236196, while the sum is 49.

The square root of 991326199 is about 31485.3330774823. Note that the first 3 decimals coincide. The cubic root of 991326199 is about 997.1003330585.

The spelling of 991326199 in words is "nine hundred ninety-one million, three hundred twenty-six thousand, one hundred ninety-nine".