12187591 has 8 divisors (see below), whose sum is σ = 13153280. Its totient is φ = 11225952.

The previous prime is 12187579. The next prime is 12187597. The reversal of 12187591 is 19578121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12187591 - 2⁷ = 12187463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12187597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8890 + ... + 10168.

It is an arithmetic number, because the mean of its divisors is an integer number (1644160).

Almost surely, 2^12187591 is an apocalyptic number.

12187591 is a deficient number, since it is larger than the sum of its proper divisors (965689).

12187591 is a wasteful number, since it uses less digits than its factorization.

12187591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025.

The product of its digits is 5040, while the sum is 34.

The square root of 12187591 is about 3491.0730442086. The cubic root of 12187591 is about 230.1296748272.

The spelling of 12187591 in words is "twelve million, one hundred eighty-seven thousand, five hundred ninety-one".