12645161 has 4 divisors (see below), whose sum is σ = 13389012. Its totient is φ = 11901312.

The previous prime is 12645107. The next prime is 12645163. The reversal of 12645161 is 16154621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9859600 + 2785561 = 3140^2 + 1669^2 .

It is a cyclic number.

It is not a de Polignac number, because 12645161 - 2¹⁸ = 12383017 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 12645161.

It is not an unprimeable number, because it can be changed into a prime (12645163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371900 + ... + 371933.

It is an arithmetic number, because the mean of its divisors is an integer number (3347253).

Almost surely, 2^12645161 is an apocalyptic number.

It is an amenable number.

12645161 is a deficient number, since it is larger than the sum of its proper divisors (743851).

12645161 is an equidigital number, since it uses as much as digits as its factorization.

12645161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743850.

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

The square root of 12645161 is about 3556.0035151839. The cubic root of 12645161 is about 232.9743566245.

Adding to 12645161 its reverse (16154621), we get a palindrome (28799782).

The spelling of 12645161 in words is "twelve million, six hundred forty-five thousand, one hundred sixty-one".