12287521 has 4 divisors (see below), whose sum is σ = 12299332. Its totient is φ = 12275712.

The previous prime is 12287519. The next prime is 12287531. The reversal of 12287521 is 12578221.

12287521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12578221 = 163 ⋅77167.

It can be written as a sum of positive squares in 2 ways, for example, as 4669921 + 7617600 = 2161^2 + 2760^2 .

It is a cyclic number.

It is not a de Polignac number, because 12287521 - 2¹ = 12287519 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12287521.

It is not an unprimeable number, because it can be changed into a prime (12287531) 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, 4176 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (3074833).

Almost surely, 2^12287521 is an apocalyptic number.

It is an amenable number.

12287521 is a deficient number, since it is larger than the sum of its proper divisors (11811).

12287521 is a wasteful number, since it uses less digits than its factorization.

12287521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11810.

The product of its digits is 2240, while the sum is 28.

The square root of 12287521 is about 3505.3560446836. The cubic root of 12287521 is about 230.7569327834.

The spelling of 12287521 in words is "twelve million, two hundred eighty-seven thousand, five hundred twenty-one".