11010991 has 4 divisors (see below), whose sum is σ = 11134800. Its totient is φ = 10887184.

The previous prime is 11010971. The next prime is 11011003. The reversal of 11010991 is 19901011.

11010991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19901011 = 13 ⋅1530847.

It is a cyclic number.

It is not a de Polignac number, because 11010991 - 2⁹ = 11010479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11010971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61771 + ... + 61948.

It is an arithmetic number, because the mean of its divisors is an integer number (2783700).

Almost surely, 2^11010991 is an apocalyptic number.

11010991 is a deficient number, since it is larger than the sum of its proper divisors (123809).

11010991 is an equidigital number, since it uses as much as digits as its factorization.

11010991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123808.

The product of its (nonzero) digits is 81, while the sum is 22.

The square root of 11010991 is about 3318.2813322562. The cubic root of 11010991 is about 222.4720564158.

The spelling of 11010991 in words is "eleven million, ten thousand, nine hundred ninety-one".