12521161 has 4 divisors (see below), whose sum is σ = 12708112. Its totient is φ = 12334212.

The previous prime is 12521149. The next prime is 12521189. The reversal of 12521161 is 16112521.

12521161 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12521161 - 2¹¹ = 12519113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12521101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93375 + ... + 93508.

It is an arithmetic number, because the mean of its divisors is an integer number (3177028).

Almost surely, 2^12521161 is an apocalyptic number.

It is an amenable number.

12521161 is a deficient number, since it is larger than the sum of its proper divisors (186951).

12521161 is an equidigital number, since it uses as much as digits as its factorization.

12521161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186950.

The product of its digits is 120, while the sum is 19.

The square root of 12521161 is about 3538.5252577875. The cubic root of 12521161 is about 232.2103287315.

Adding to 12521161 its reverse (16112521), we get a palindrome (28633682).

The spelling of 12521161 in words is "twelve million, five hundred twenty-one thousand, one hundred sixty-one".