11101661 has 2 divisors, whose sum is σ = 11101662. Its totient is φ = 11101660.

The previous prime is 11101619. The next prime is 11101667. The reversal of 11101661 is 16610111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5784025 + 5317636 = 2405^2 + 2306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11101661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11101667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5550830 + 5550831.

It is an arithmetic number, because the mean of its divisors is an integer number (5550831).

Almost surely, 2^11101661 is an apocalyptic number.

It is an amenable number.

11101661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11101661 is an equidigital number, since it uses as much as digits as its factorization.

11101661 is an evil number, because the sum of its binary digits is even.

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

The square root of 11101661 is about 3331.9155151354. The cubic root of 11101661 is about 223.0810365929.

Adding to 11101661 its reverse (16610111), we get a palindrome (27711772).

The spelling of 11101661 in words is "eleven million, one hundred one thousand, six hundred sixty-one".