12131544 has 16 divisors (see below), whose sum is σ = 30328920. Its totient is φ = 4043840.

The previous prime is 12131543. The next prime is 12131549. The reversal of 12131544 is 44513121.

12131544 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 12131544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131543) 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, 252717 + ... + 252764.

Almost surely, 2^12131544 is an apocalyptic number.

It is an amenable number.

12131544 is an abundant number, since it is smaller than the sum of its proper divisors (18197376).

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

12131544 is a wasteful number, since it uses less digits than its factorization.

12131544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505490 (or 505486 counting only the distinct ones).

The product of its digits is 480, while the sum is 21.

The square root of 12131544 is about 3483.0366061815. The cubic root of 12131544 is about 229.7763673801.

Adding to 12131544 its reverse (44513121), we get a palindrome (56644665).

The spelling of 12131544 in words is "twelve million, one hundred thirty-one thousand, five hundred forty-four".