12187081 has 3 divisors (see below), whose sum is σ = 12190573. Its totient is φ = 12183590.

The previous prime is 12187073. The next prime is 12187117. The reversal of 12187081 is 18078121.

The square root of 12187081 is 3491.

It is a perfect power (a square), and thus also a powerful number.

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 not a de Polignac number, because 12187081 - 2³ = 12187073 is a prime.

It is a super-2 number, since 2×12187081² = 297049886601122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12187051) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1746 + ... + 5236.

Almost surely, 2^12187081 is an apocalyptic number.

12187081 is the 3491-st square number.

12187081 is the 1746-th centered octagonal number.

It is an amenable number.

12187081 is a deficient number, since it is larger than the sum of its proper divisors (3492).

12187081 is an frugal number, since it uses more digits than its factorization.

12187081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6982 (or 3491 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 28.

The cubic root of 12187081 is about 230.1264647925.

The spelling of 12187081 in words is "twelve million, one hundred eighty-seven thousand, eighty-one".