991686119 has 2 divisors, whose sum is σ = 991686120. Its totient is φ = 991686118.

The previous prime is 991686083. The next prime is 991686121. The reversal of 991686119 is 911686199.

It is a strong prime.

It is an emirp because it is prime and its reverse (911686199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 991686119 - 2²⁴ = 974908903 is a prime.

It is a super-2 number, since 2×991686119² = 1966882717234564322, which contains 22 as substring.

Together with 991686121, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991686169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495843059 + 495843060.

It is an arithmetic number, because the mean of its divisors is an integer number (495843060).

Almost surely, 2^991686119 is an apocalyptic number.

991686119 is a deficient number, since it is larger than the sum of its proper divisors (1).

991686119 is an equidigital number, since it uses as much as digits as its factorization.

991686119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 50.

The square root of 991686119 is about 31491.0482359670. The cubic root of 991686119 is about 997.2209905941.

The spelling of 991686119 in words is "nine hundred ninety-one million, six hundred eighty-six thousand, one hundred nineteen".