991112107 has 2 divisors, whose sum is σ = 991112108. Its totient is φ = 991112106.

The previous prime is 991112093. The next prime is 991112119. The reversal of 991112107 is 701211199.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991112107 - 2¹¹ = 991110059 is a prime.

It is not a weakly prime, because it can be changed into another prime (991112197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495556053 + 495556054.

It is an arithmetic number, because the mean of its divisors is an integer number (495556054).

Almost surely, 2^991112107 is an apocalyptic number.

991112107 is a deficient number, since it is larger than the sum of its proper divisors (1).

991112107 is an equidigital number, since it uses as much as digits as its factorization.

991112107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 31.

The square root of 991112107 is about 31481.9330251495. The cubic root of 991112107 is about 997.0285482198.

The spelling of 991112107 in words is "nine hundred ninety-one million, one hundred twelve thousand, one hundred seven".