13581136 has 20 divisors (see below), whose sum is σ = 26412372. Its totient is φ = 6765056.

The previous prime is 13581121. The next prime is 13581137. The reversal of 13581136 is 63118531.

It can be written as a sum of positive squares in 2 ways, for example, as 7529536 + 6051600 = 2744^2 + 2460^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13581137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3240 + ... + 6136.

Almost surely, 2^13581136 is an apocalyptic number.

13581136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13581136 is a deficient number, since it is larger than the sum of its proper divisors (12831236).

13581136 is a wasteful number, since it uses less digits than its factorization.

13581136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198 (or 3192 counting only the distinct ones).

The product of its digits is 2160, while the sum is 28.

The square root of 13581136 is about 3685.2592853149. The cubic root of 13581136 is about 238.5862252271.

Adding to 13581136 its reverse (63118531), we get a palindrome (76699667).

The spelling of 13581136 in words is "thirteen million, five hundred eighty-one thousand, one hundred thirty-six".