12487081 has 4 divisors (see below), whose sum is σ = 12917700. Its totient is φ = 12056464.

The previous prime is 12487073. The next prime is 12487099. The reversal of 12487081 is 18078421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18078421 = 769 ⋅23509.

It can be written as a sum of positive squares in 2 ways, for example, as 2374681 + 10112400 = 1541^2 + 3180^2 .

It is a cyclic number.

It is not a de Polignac number, because 12487081 - 2³ = 12487073 is a prime.

It is a super-2 number, since 2×12487081² = 311854383801122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12487031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215266 + ... + 215323.

It is an arithmetic number, because the mean of its divisors is an integer number (3229425).

Almost surely, 2^12487081 is an apocalyptic number.

It is an amenable number.

12487081 is a deficient number, since it is larger than the sum of its proper divisors (430619).

12487081 is an equidigital number, since it uses as much as digits as its factorization.

12487081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430618.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 12487081 is about 3533.7064111213. The cubic root of 12487081 is about 231.9994612056. Note that the first 3 decimals are identical.

The spelling of 12487081 in words is "twelve million, four hundred eighty-seven thousand, eighty-one".