12461561 has 32 divisors (see below), whose sum is σ = 16381440. Its totient is φ = 9225216.

The previous prime is 12461551. The next prime is 12461591. The reversal of 12461561 is 16516421.

It is not a de Polignac number, because 12461561 - 2⁶ = 12461497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12461561.

It is not an unprimeable number, because it can be changed into a prime (12461551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79295 + ... + 79451.

It is an arithmetic number, because the mean of its divisors is an integer number (511920).

Almost surely, 2^12461561 is an apocalyptic number.

It is an amenable number.

12461561 is a deficient number, since it is larger than the sum of its proper divisors (3919879).

12461561 is a wasteful number, since it uses less digits than its factorization.

12461561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233.

The product of its digits is 1440, while the sum is 26.

The square root of 12461561 is about 3530.0936248207. The cubic root of 12461561 is about 231.8413067048.

Adding to 12461561 its reverse (16516421), we get a palindrome (28977982).

The spelling of 12461561 in words is "twelve million, four hundred sixty-one thousand, five hundred sixty-one".