11691986 has 4 divisors (see below), whose sum is σ = 17537982. Its totient is φ = 5845992.

The previous prime is 11691983. The next prime is 11691989. The reversal of 11691986 is 68919611.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (11691983) and next prime (11691989).

It can be written as a sum of positive squares in only one way, i.e., 8886361 + 2805625 = 2981^2 + 1675^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11691983) 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, 2922995 + ... + 2922998.

Almost surely, 2^11691986 is an apocalyptic number.

11691986 is a deficient number, since it is larger than the sum of its proper divisors (5845996).

11691986 is an equidigital number, since it uses as much as digits as its factorization.

11691986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5845995.

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

The square root of 11691986 is about 3419.3546174680. The cubic root of 11691986 is about 226.9670234850.

The spelling of 11691986 in words is "eleven million, six hundred ninety-one thousand, nine hundred eighty-six".