12087261 has 6 divisors (see below), whose sum is σ = 17459390. Its totient is φ = 8058168.

The previous prime is 12087247. The next prime is 12087263. The reversal of 12087261 is 16278021.

12087261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11431161 + 656100 = 3381^2 + 810^2 .

It is not a de Polignac number, because 12087261 - 2⁹ = 12086749 is a prime.

It is a super-2 number, since 2×12087261² = 292203756964242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12087263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 671506 + ... + 671523.

Almost surely, 2^12087261 is an apocalyptic number.

It is an amenable number.

12087261 is a deficient number, since it is larger than the sum of its proper divisors (5372129).

12087261 is a wasteful number, since it uses less digits than its factorization.

12087261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343035 (or 1343032 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 12087261 is about 3476.6738414755. The cubic root of 12087261 is about 229.4964471804.

The spelling of 12087261 in words is "twelve million, eighty-seven thousand, two hundred sixty-one".