11011661 has 2 divisors, whose sum is σ = 11011662. Its totient is φ = 11011660.

The previous prime is 11011613. The next prime is 11011667. The reversal of 11011661 is 16611011.

11011661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10530025 + 481636 = 3245^2 + 694^2 .

It is an emirp because it is prime and its reverse (16611011) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11011661 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 (11011667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5505830 + 5505831.

It is an arithmetic number, because the mean of its divisors is an integer number (5505831).

Almost surely, 2^11011661 is an apocalyptic number.

It is an amenable number.

11011661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11011661 is an equidigital number, since it uses as much as digits as its factorization.

11011661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 11011661 is about 3318.3822865969. The cubic root of 11011661 is about 222.4765686726.

Adding to 11011661 its reverse (16611011), we get a palindrome (27622672).

The spelling of 11011661 in words is "eleven million, eleven thousand, six hundred sixty-one".