11011391 has 4 divisors (see below), whose sum is σ = 11029800. Its totient is φ = 10992984.

The previous prime is 11011381. The next prime is 11011409. The reversal of 11011391 is 19311011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011391 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 (11011321) 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, 8276 + ... + 9513.

It is an arithmetic number, because the mean of its divisors is an integer number (2757450).

Almost surely, 2^11011391 is an apocalyptic number.

11011391 is a deficient number, since it is larger than the sum of its proper divisors (18409).

11011391 is an equidigital number, since it uses as much as digits as its factorization.

11011391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18408.

The product of its (nonzero) digits is 27, while the sum is 17.

The square root of 11011391 is about 3318.3416038738. The cubic root of 11011391 is about 222.4747503225.

The spelling of 11011391 in words is "eleven million, eleven thousand, three hundred ninety-one".