13661012 has 12 divisors (see below), whose sum is σ = 23945460. Its totient is φ = 6819456.

The previous prime is 13661003. The next prime is 13661017. The reversal of 13661012 is 21016631.

It can be written as a sum of positive squares in 2 ways, for example, as 1522756 + 12138256 = 1234^2 + 3484^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13661017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428 + ... + 5244.

It is an arithmetic number, because the mean of its divisors is an integer number (1995455).

Almost surely, 2^13661012 is an apocalyptic number.

It is an amenable number.

13661012 is a deficient number, since it is larger than the sum of its proper divisors (10284448).

13661012 is a wasteful number, since it uses less digits than its factorization.

13661012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530 (or 5528 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 13661012 is about 3696.0806268262. The cubic root of 13661012 is about 239.0530510199.

Adding to 13661012 its reverse (21016631), we get a palindrome (34677643).

The spelling of 13661012 in words is "thirteen million, six hundred sixty-one thousand, twelve".