11986691 has 2 divisors, whose sum is σ = 11986692. Its totient is φ = 11986690.

The previous prime is 11986669. The next prime is 11986693. The reversal of 11986691 is 19668911.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11986691 - 2⁶ = 11986627 is a prime.

It is a super-2 number, since 2×11986691² = 287361522258962, which contains 22 as substring.

Together with 11986693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11986693) 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, 5993345 + 5993346.

It is an arithmetic number, because the mean of its divisors is an integer number (5993346).

Almost surely, 2^11986691 is an apocalyptic number.

11986691 is a deficient number, since it is larger than the sum of its proper divisors (1).

11986691 is an equidigital number, since it uses as much as digits as its factorization.

11986691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 41.

The square root of 11986691 is about 3462.1800935249. The cubic root of 11986691 is about 228.8581783017.

The spelling of 11986691 in words is "eleven million, nine hundred eighty-six thousand, six hundred ninety-one".