11188997 has 2 divisors, whose sum is σ = 11188998. Its totient is φ = 11188996.

The previous prime is 11188979. The next prime is 11189027. The reversal of 11188997 is 79988111.

11188997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (11188979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 73441 = 3334^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 11188997 - 2¹⁰ = 11187973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11188897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5594498 + 5594499.

It is an arithmetic number, because the mean of its divisors is an integer number (5594499).

Almost surely, 2^11188997 is an apocalyptic number.

It is an amenable number.

11188997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11188997 is an equidigital number, since it uses as much as digits as its factorization.

11188997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 44.

The square root of 11188997 is about 3344.9958146461. The cubic root of 11188997 is about 223.6644969434.

The spelling of 11188997 in words is "eleven million, one hundred eighty-eight thousand, nine hundred ninety-seven".