9991133 has 2 divisors, whose sum is σ = 9991134. Its totient is φ = 9991132.

The previous prime is 9991127. The next prime is 9991139. The reversal of 9991133 is 3311999.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (9991127) and next prime (9991139).

It can be written as a sum of positive squares in only one way, i.e., 8282884 + 1708249 = 2878^2 + 1307^2 .

It is an emirp because it is prime and its reverse (3311999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9991133 - 2²² = 5796829 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9991093 and 9991102.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9991139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995566 + 4995567.

It is an arithmetic number, because the mean of its divisors is an integer number (4995567).

Almost surely, 2^9991133 is an apocalyptic number.

It is an amenable number.

9991133 is a deficient number, since it is larger than the sum of its proper divisors (1).

9991133 is an equidigital number, since it uses as much as digits as its factorization.

9991133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6561, while the sum is 35.

The square root of 9991133 is about 3160.8753534425. The cubic root of 9991133 is about 215.3797722649.

The spelling of 9991133 in words is "nine million, nine hundred ninety-one thousand, one hundred thirty-three".