11091889 has 2 divisors, whose sum is σ = 11091890. Its totient is φ = 11091888.

The previous prime is 11091887. The next prime is 11091907. The reversal of 11091889 is 98819011.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10131489 + 960400 = 3183^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 11091889 - 2¹ = 11091887 is a prime.

Together with 11091887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11091887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5545944 + 5545945.

It is an arithmetic number, because the mean of its divisors is an integer number (5545945).

Almost surely, 2^11091889 is an apocalyptic number.

It is an amenable number.

11091889 is a deficient number, since it is larger than the sum of its proper divisors (1).

11091889 is an equidigital number, since it uses as much as digits as its factorization.

11091889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 11091889 is about 3330.4487685596. The cubic root of 11091889 is about 223.0155632726.

The spelling of 11091889 in words is "eleven million, ninety-one thousand, eight hundred eighty-nine".