11987171 has 16 divisors (see below), whose sum is σ = 14165760. Its totient is φ = 9931680.

The previous prime is 11987167. The next prime is 11987177. The reversal of 11987171 is 17178911.

It is a cyclic number.

It is not a de Polignac number, because 11987171 - 2² = 11987167 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11987177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28400 + ... + 28818.

It is an arithmetic number, because the mean of its divisors is an integer number (885360).

Almost surely, 2^11987171 is an apocalyptic number.

11987171 is a deficient number, since it is larger than the sum of its proper divisors (2178589).

11987171 is an equidigital number, since it uses as much as digits as its factorization.

11987171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554.

The product of its digits is 3528, while the sum is 35.

The square root of 11987171 is about 3462.2494133150. The cubic root of 11987171 is about 228.8612330913.

The spelling of 11987171 in words is "eleven million, nine hundred eighty-seven thousand, one hundred seventy-one".