11491889 has 2 divisors, whose sum is σ = 11491890. Its totient is φ = 11491888.

The previous prime is 11491877. The next prime is 11491901. The reversal of 11491889 is 98819411.

It is a balanced prime because it is at equal distance from previous prime (11491877) and next prime (11491901).

It can be written as a sum of positive squares in only one way, i.e., 11122225 + 369664 = 3335^2 + 608^2 .

It is a cyclic number.

It is not a de Polignac number, because 11491889 - 2⁴ = 11491873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11499889) 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 as a sum of consecutive naturals, namely, 5745944 + 5745945.

It is an arithmetic number, because the mean of its divisors is an integer number (5745945).

Almost surely, 2^11491889 is an apocalyptic number.

It is an amenable number.

11491889 is a deficient number, since it is larger than the sum of its proper divisors (1).

11491889 is an equidigital number, since it uses as much as digits as its factorization.

11491889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 41.

The square root of 11491889 is about 3389.9688789132. The cubic root of 11491889 is about 225.6647926940.

The spelling of 11491889 in words is "eleven million, four hundred ninety-one thousand, eight hundred eighty-nine".