999991133 has 2 divisors, whose sum is σ = 999991134. Its totient is φ = 999991132.

The previous prime is 999991123. The next prime is 999991141. The reversal of 999991133 is 331199999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 908540164 + 91450969 = 30142^2 + 9563^2 .

It is a cyclic number.

It is not a de Polignac number, because 999991133 - 2⁸ = 999990877 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999991123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499995566 + 499995567.

It is an arithmetic number, because the mean of its divisors is an integer number (499995567).

Almost surely, 2^999991133 is an apocalyptic number.

It is an amenable number.

999991133 is a deficient number, since it is larger than the sum of its proper divisors (1).

999991133 is an equidigital number, since it uses as much as digits as its factorization.

999991133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 531441, while the sum is 53.

The square root of 999991133 is about 31622.6364017929. The cubic root of 999991133 is about 999.9970443246.

The spelling of 999991133 in words is "nine hundred ninety-nine million, nine hundred ninety-one thousand, one hundred thirty-three".