13661131 has 4 divisors (see below), whose sum is σ = 14903064. Its totient is φ = 12419200.

The previous prime is 13661083. The next prime is 13661191. The reversal of 13661131 is 13116631.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13661131 - 2⁷ = 13661003 is a prime.

It is a super-2 number, since 2×13661131² = 373253000398322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (13661191) 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, 620950 + ... + 620971.

It is an arithmetic number, because the mean of its divisors is an integer number (3725766).

Almost surely, 2^13661131 is an apocalyptic number.

13661131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13661131 is a deficient number, since it is larger than the sum of its proper divisors (1241933).

13661131 is a wasteful number, since it uses less digits than its factorization.

13661131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241932.

The product of its digits is 324, while the sum is 22.

The square root of 13661131 is about 3696.0967249248. The cubic root of 13661131 is about 239.0537451420.

Adding to 13661131 its reverse (13116631), we get a palindrome (26777762).

The spelling of 13661131 in words is "thirteen million, six hundred sixty-one thousand, one hundred thirty-one".