11986661 has 2 divisors, whose sum is σ = 11986662. Its totient is φ = 11986660.

The previous prime is 11986643. The next prime is 11986669. The reversal of 11986661 is 16668911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11730625 + 256036 = 3425^2 + 506^2 .

It is a cyclic number.

It is not a de Polignac number, because 11986661 - 2²² = 7792357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11986669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5993330 + 5993331.

It is an arithmetic number, because the mean of its divisors is an integer number (5993331).

Almost surely, 2^11986661 is an apocalyptic number.

It is an amenable number.

11986661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11986661 is an equidigital number, since it uses as much as digits as its factorization.

11986661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 38.

The square root of 11986661 is about 3462.1757609919. The cubic root of 11986661 is about 228.8579873746.

The spelling of 11986661 in words is "eleven million, nine hundred eighty-six thousand, six hundred sixty-one".