12162561 has 16 divisors (see below), whose sum is σ = 17003520. Its totient is φ = 7718480.

The previous prime is 12162559. The next prime is 12162587. The reversal of 12162561 is 16526121.

It is a cyclic number.

It is not a de Polignac number, because 12162561 - 2¹ = 12162559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12162541) 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, 24526 + ... + 25016.

It is an arithmetic number, because the mean of its divisors is an integer number (1062720).

Almost surely, 2^12162561 is an apocalyptic number.

It is an amenable number.

12162561 is a deficient number, since it is larger than the sum of its proper divisors (4840959).

12162561 is a wasteful number, since it uses less digits than its factorization.

12162561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876.

The product of its digits is 720, while the sum is 24.

The square root of 12162561 is about 3487.4863440593. The cubic root of 12162561 is about 229.9720255832.

Adding to 12162561 its reverse (16526121), we get a palindrome (28688682).

The spelling of 12162561 in words is "twelve million, one hundred sixty-two thousand, five hundred sixty-one".