11891091 has 8 divisors (see below), whose sum is σ = 16223680. Its totient is φ = 7742952.

The previous prime is 11891083. The next prime is 11891111. The reversal of 11891091 is 19019811.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11891091 - 2³ = 11891083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11891021) 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 7 ways as a sum of consecutive naturals, for example, 45961 + ... + 46218.

It is an arithmetic number, because the mean of its divisors is an integer number (2027960).

Almost surely, 2^11891091 is an apocalyptic number.

11891091 is a deficient number, since it is larger than the sum of its proper divisors (4332589).

11891091 is an equidigital number, since it uses as much as digits as its factorization.

11891091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92225.

The product of its (nonzero) digits is 648, while the sum is 30.

The square root of 11891091 is about 3448.3461253186. The cubic root of 11891091 is about 228.2481332127.

The spelling of 11891091 in words is "eleven million, eight hundred ninety-one thousand, ninety-one".