11191087 has 4 divisors (see below), whose sum is σ = 11677680. Its totient is φ = 10704496.

The previous prime is 11191043. The next prime is 11191099. The reversal of 11191087 is 78019111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78019111 = 19 ⋅4106269.

It is a cyclic number.

It is not a de Polignac number, because 11191087 - 2¹¹ = 11189039 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 (11191027) 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 in 3 ways as a sum of consecutive naturals, for example, 243262 + ... + 243307.

It is an arithmetic number, because the mean of its divisors is an integer number (2919420).

Almost surely, 2^11191087 is an apocalyptic number.

11191087 is a deficient number, since it is larger than the sum of its proper divisors (486593).

11191087 is an equidigital number, since it uses as much as digits as its factorization.

11191087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486592.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 11191087 is about 3345.3082070267. The cubic root of 11191087 is about 223.6784222219.

The spelling of 11191087 in words is "eleven million, one hundred ninety-one thousand, eighty-seven".