9991067 has 2 divisors, whose sum is σ = 9991068. Its totient is φ = 9991066.

The previous prime is 9991063. The next prime is 9991123. The reversal of 9991067 is 7601999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9991067 - 2² = 9991063 is a prime.

It is not a weakly prime, because it can be changed into another prime (9991063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995533 + 4995534.

It is an arithmetic number, because the mean of its divisors is an integer number (4995534).

Almost surely, 2^9991067 is an apocalyptic number.

9991067 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991067 is an equidigital number, since it uses as much as digits as its factorization.

9991067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 9991067 is about 3160.8649132793. The cubic root of 9991067 is about 215.3792980078.

The spelling of 9991067 in words is "nine million, nine hundred ninety-one thousand, sixty-seven".