12509161 has 12 divisors (see below), whose sum is σ = 15408468. Its totient is φ = 10090752.

The previous prime is 12509149. The next prime is 12509177. The reversal of 12509161 is 16190521.

It can be written as a sum of positive squares in 2 ways, for example, as 7075600 + 5433561 = 2660^2 + 2331^2 .

It is not a de Polignac number, because 12509161 - 2⁵ = 12509129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12509131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6676 + ... + 8341.

It is an arithmetic number, because the mean of its divisors is an integer number (1284039).

Almost surely, 2^12509161 is an apocalyptic number.

It is an amenable number.

12509161 is a deficient number, since it is larger than the sum of its proper divisors (2899307).

12509161 is a wasteful number, since it uses less digits than its factorization.

12509161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15048 (or 15041 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 12509161 is about 3536.8292296915. The cubic root of 12509161 is about 232.1361232964.

Adding to 12509161 its reverse (16190521), we get a palindrome (28699682).

The spelling of 12509161 in words is "twelve million, five hundred nine thousand, one hundred sixty-one".