13611131 has 4 divisors (see below), whose sum is σ = 13662000. Its totient is φ = 13560264.

The previous prime is 13611119. The next prime is 13611133. The reversal of 13611131 is 13111631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13111631 = 13 ⋅1008587.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13611131 is a prime.

It is a super-2 number, since 2×13611131² = 370525774198322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13611133) 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, 25031 + ... + 25568.

It is an arithmetic number, because the mean of its divisors is an integer number (3415500).

Almost surely, 2^13611131 is an apocalyptic number.

13611131 is a deficient number, since it is larger than the sum of its proper divisors (50869).

13611131 is an equidigital number, since it uses as much as digits as its factorization.

13611131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50868.

The product of its digits is 54, while the sum is 17.

The square root of 13611131 is about 3689.3266323274. The cubic root of 13611131 is about 238.7617415166.

Adding to 13611131 its reverse (13111631), we get a palindrome (26722762).

Subtracting from 13611131 its reverse (13111631), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 13611131 in words is "thirteen million, six hundred eleven thousand, one hundred thirty-one".