11971187 has 4 divisors (see below), whose sum is σ = 11981280. Its totient is φ = 11961096.

The previous prime is 11971117. The next prime is 11971199. The reversal of 11971187 is 78117911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11971187 - 2¹² = 11967091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11971117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2987 + ... + 5732.

It is an arithmetic number, because the mean of its divisors is an integer number (2995320).

Almost surely, 2^11971187 is an apocalyptic number.

11971187 is a deficient number, since it is larger than the sum of its proper divisors (10093).

11971187 is an equidigital number, since it uses as much as digits as its factorization.

11971187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10092.

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

The square root of 11971187 is about 3459.9403174043. The cubic root of 11971187 is about 228.7594647064.

The spelling of 11971187 in words is "eleven million, nine hundred seventy-one thousand, one hundred eighty-seven".