9991063 has 2 divisors, whose sum is σ = 9991064. Its totient is φ = 9991062.

The previous prime is 9991057. The next prime is 9991067. The reversal of 9991063 is 3601999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9991063 - 2⁹ = 9990551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991067) 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, 4995531 + 4995532.

It is an arithmetic number, because the mean of its divisors is an integer number (4995532).

Almost surely, 2^9991063 is an apocalyptic number.

9991063 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991063 is an equidigital number, since it uses as much as digits as its factorization.

9991063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 9991063 is about 3160.8642805410. The cubic root of 9991063 is about 215.3792692649.

The spelling of 9991063 in words is "nine million, nine hundred ninety-one thousand, sixty-three".