12509136 has 30 divisors (see below), whose sum is σ = 35008610. Its totient is φ = 4169664.

The previous prime is 12509131. The next prime is 12509143. The reversal of 12509136 is 63190521.

It can be written as a sum of positive squares in only one way, i.e., 9884736 + 2624400 = 3144^2 + 1620^2 .

It is a congruent 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 5 ways as a sum of consecutive naturals, for example, 43291 + ... + 43578.

Almost surely, 2^12509136 is an apocalyptic number.

12509136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12509136 is an abundant number, since it is smaller than the sum of its proper divisors (22499474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12509136 is a wasteful number, since it uses less digits than its factorization.

12509136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86883 (or 86874 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 12509136 is about 3536.8256954507. The cubic root of 12509136 is about 232.1359686522.

Adding to 12509136 its reverse (63190521), we get a palindrome (75699657).

The spelling of 12509136 in words is "twelve million, five hundred nine thousand, one hundred thirty-six".