10891091 has 4 divisors (see below), whose sum is σ = 10898784. Its totient is φ = 10883400.

The previous prime is 10891087. The next prime is 10891099. The reversal of 10891091 is 19019801.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 10891091 - 2² = 10891087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10891099) 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, 1040 + ... + 4781.

It is an arithmetic number, because the mean of its divisors is an integer number (2724696).

Almost surely, 2^10891091 is an apocalyptic number.

10891091 is a deficient number, since it is larger than the sum of its proper divisors (7693).

10891091 is an equidigital number, since it uses as much as digits as its factorization.

10891091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7692.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 10891091 is about 3300.1652988903. The cubic root of 10891091 is about 221.6615992460.

The spelling of 10891091 in words is "ten million, eight hundred ninety-one thousand, ninety-one".