12561305 has 8 divisors (see below), whose sum is σ = 15093000. Its totient is φ = 10036096.

The previous prime is 12561301. The next prime is 12561313. The reversal of 12561305 is 50316521.

It can be written as a sum of positive squares in 4 ways, for example, as 4648336 + 7912969 = 2156^2 + 2813^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12561305 - 2² = 12561301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12561301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5471 + ... + 7419.

It is an arithmetic number, because the mean of its divisors is an integer number (1886625).

Almost surely, 2^12561305 is an apocalyptic number.

It is an amenable number.

12561305 is a deficient number, since it is larger than the sum of its proper divisors (2531695).

12561305 is a wasteful number, since it uses less digits than its factorization.

12561305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3243.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 12561305 is about 3544.1931380781. The cubic root of 12561305 is about 232.4582265876.

Adding to 12561305 its reverse (50316521), we get a palindrome (62877826).

The spelling of 12561305 in words is "twelve million, five hundred sixty-one thousand, three hundred five".