12561223 has 4 divisors (see below), whose sum is σ = 13222360. Its totient is φ = 11900088.

The previous prime is 12561221. The next prime is 12561229. The reversal of 12561223 is 32216521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12561223 - 2¹ = 12561221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12561194 and 12561203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561221) 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, 330540 + ... + 330577.

It is an arithmetic number, because the mean of its divisors is an integer number (3305590).

Almost surely, 2^12561223 is an apocalyptic number.

12561223 is a deficient number, since it is larger than the sum of its proper divisors (661137).

12561223 is an equidigital number, since it uses as much as digits as its factorization.

12561223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661136.

The product of its digits is 720, while the sum is 22.

The square root of 12561223 is about 3544.1815698409. The cubic root of 12561223 is about 232.4577207586.

Adding to 12561223 its reverse (32216521), we get a palindrome (44777744).

The spelling of 12561223 in words is "twelve million, five hundred sixty-one thousand, two hundred twenty-three".