13181331 has 8 divisors (see below), whose sum is σ = 17604864. Its totient is φ = 8772680.

The previous prime is 13181317. The next prime is 13181347. The reversal of 13181331 is 13318131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13181331 - 2⁵ = 13181299 is a prime.

It is a super-2 number, since 2×13181331² = 347494973863122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13181298 and 13181307.

It is not an unprimeable number, because it can be changed into a prime (13182331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1455 + ... + 5336.

It is an arithmetic number, because the mean of its divisors is an integer number (2200608).

Almost surely, 2^13181331 is an apocalyptic number.

13181331 is the 1941-st nonagonal number.

13181331 is a deficient number, since it is larger than the sum of its proper divisors (4423533).

13181331 is an equidigital number, since it uses as much as digits as its factorization.

13181331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7441.

The product of its digits is 216, while the sum is 21.

The square root of 13181331 is about 3630.6102792781. The cubic root of 13181331 is about 236.2216807689.

Adding to 13181331 its reverse (13318131), we get a palindrome (26499462).

The spelling of 13181331 in words is "thirteen million, one hundred eighty-one thousand, three hundred thirty-one".