12481561 has 4 divisors (see below), whose sum is σ = 12884224. Its totient is φ = 12078900.

The previous prime is 12481559. The next prime is 12481619. The reversal of 12481561 is 16518421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16518421 = 97 ⋅170293.

It is a cyclic number.

It is not a de Polignac number, because 12481561 - 2¹ = 12481559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12481531) 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, 201285 + ... + 201346.

It is an arithmetic number, because the mean of its divisors is an integer number (3221056).

Almost surely, 2^12481561 is an apocalyptic number.

It is an amenable number.

12481561 is a deficient number, since it is larger than the sum of its proper divisors (402663).

12481561 is an equidigital number, since it uses as much as digits as its factorization.

12481561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402662.

The product of its digits is 1920, while the sum is 28.

The square root of 12481561 is about 3532.9252751792. The cubic root of 12481561 is about 231.9652705148.

Adding to 12481561 its reverse (16518421), we get a palindrome (28999982).

It can be divided in two parts, 1248 and 1561, that added together give a square (2809 = 53²).

The spelling of 12481561 in words is "twelve million, four hundred eighty-one thousand, five hundred sixty-one".