99991063 has 2 divisors, whose sum is σ = 99991064. Its totient is φ = 99991062.

The previous prime is 99991049. The next prime is 99991081. The reversal of 99991063 is 36019999.

It is a weak prime.

It is an emirp because it is prime and its reverse (36019999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99991063 - 2⁹ = 99990551 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99991033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49995531 + 49995532.

It is an arithmetic number, because the mean of its divisors is an integer number (49995532).

Almost surely, 2^99991063 is an apocalyptic number.

99991063 is a deficient number, since it is larger than the sum of its proper divisors (1).

99991063 is an equidigital number, since it uses as much as digits as its factorization.

99991063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 118098, while the sum is 46.

The square root of 99991063 is about 9999.5531400158. The cubic root of 99991063 is about 464.1450556562.

The spelling of 99991063 in words is "ninety-nine million, nine hundred ninety-one thousand, sixty-three".