11986571 has 2 divisors, whose sum is σ = 11986572. Its totient is φ = 11986570.

The previous prime is 11986529. The next prime is 11986573. The reversal of 11986571 is 17568911.

It is a strong prime.

It is an emirp because it is prime and its reverse (17568911) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11986571 is a prime.

It is a Sophie Germain prime.

Together with 11986573, 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 (11986573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5993285 + 5993286.

It is an arithmetic number, because the mean of its divisors is an integer number (5993286).

Almost surely, 2^11986571 is an apocalyptic number.

11986571 is a deficient number, since it is larger than the sum of its proper divisors (1).

11986571 is an equidigital number, since it uses as much as digits as its factorization.

11986571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 38.

The square root of 11986571 is about 3462.1627633605. The cubic root of 11986571 is about 228.8574145915.

The spelling of 11986571 in words is "eleven million, nine hundred eighty-six thousand, five hundred seventy-one".