11020991 has 2 divisors, whose sum is σ = 11020992. Its totient is φ = 11020990.

The previous prime is 11020987. The next prime is 11021009. The reversal of 11020991 is 19902011.

It is a weak prime.

It is an emirp because it is prime and its reverse (19902011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11020991 - 2² = 11020987 is a prime.

It is a super-3 number, since 3×11020991³ (a number of 22 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11020921) 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, 5510495 + 5510496.

It is an arithmetic number, because the mean of its divisors is an integer number (5510496).

Almost surely, 2^11020991 is an apocalyptic number.

11020991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11020991 is an equidigital number, since it uses as much as digits as its factorization.

11020991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 11020991 is about 3319.7877944230. The cubic root of 11020991 is about 222.5393845191.

The spelling of 11020991 in words is "eleven million, twenty thousand, nine hundred ninety-one".