991084907 has 2 divisors, whose sum is σ = 991084908. Its totient is φ = 991084906.

The previous prime is 991084903. The next prime is 991084909. The reversal of 991084907 is 709480199.

991084907 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (709480199) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 991084907 - 2² = 991084903 is a prime.

Together with 991084909, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (991084901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495542453 + 495542454.

It is an arithmetic number, because the mean of its divisors is an integer number (495542454).

Almost surely, 2^991084907 is an apocalyptic number.

991084907 is a deficient number, since it is larger than the sum of its proper divisors (1).

991084907 is an equidigital number, since it uses as much as digits as its factorization.

991084907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 991084907 is about 31481.5010283817. The cubic root of 991084907 is about 997.0194273463.

The spelling of 991084907 in words is "nine hundred ninety-one million, eighty-four thousand, nine hundred seven".