995799991 has 2 divisors, whose sum is σ = 995799992. Its totient is φ = 995799990.

The previous prime is 995799989. The next prime is 995799997. The reversal of 995799991 is 199997599.

It is a weak prime.

It is an emirp because it is prime and its reverse (199997599) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 995799991 - 2¹ = 995799989 is a prime.

Together with 995799989, 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 (995799997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497899995 + 497899996.

It is an arithmetic number, because the mean of its divisors is an integer number (497899996).

Almost surely, 2^995799991 is an apocalyptic number.

995799991 is a deficient number, since it is larger than the sum of its proper divisors (1).

995799991 is an equidigital number, since it uses as much as digits as its factorization.

995799991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18600435, while the sum is 67.

The square root of 995799991 is about 31556.2987531808. The cubic root of 995799991 is about 998.5980324054.

The spelling of 995799991 in words is "nine hundred ninety-five million, seven hundred ninety-nine thousand, nine hundred ninety-one".