12561345 has 16 divisors (see below), whose sum is σ = 22331520. Its totient is φ = 6699312.

The previous prime is 12561331. The next prime is 12561349. The reversal of 12561345 is 54316521.

12561345 is a `hidden beast` number, since 1 + 2 + 5 + 613 + 45 = 666.

It is not a de Polignac number, because 12561345 - 2⁵ = 12561313 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12561349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46389 + ... + 46658.

It is an arithmetic number, because the mean of its divisors is an integer number (1395720).

Almost surely, 2^12561345 is an apocalyptic number.

12561345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12561345 is a deficient number, since it is larger than the sum of its proper divisors (9770175).

12561345 is an equidigital number, since it uses as much as digits as its factorization.

12561345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93061 (or 93055 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 12561345 is about 3544.1987811070. The cubic root of 12561345 is about 232.4584733326.

Adding to 12561345 its reverse (54316521), we get a palindrome (66877866).

It can be divided in two parts, 1256 and 1345, that added together give a square (2601 = 51²).

The spelling of 12561345 in words is "twelve million, five hundred sixty-one thousand, three hundred forty-five".