13081881 has 4 divisors (see below), whose sum is σ = 17442512. Its totient is φ = 8721252.

The previous prime is 13081841. The next prime is 13081903. The reversal of 13081881 is 18818031.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13081881 - 2¹⁴ = 13065497 is a prime.

It is a super-2 number, since 2×13081881² = 342271220996322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13081801) 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, 2180311 + ... + 2180316.

It is an arithmetic number, because the mean of its divisors is an integer number (4360628).

Almost surely, 2^13081881 is an apocalyptic number.

It is an amenable number.

13081881 is a deficient number, since it is larger than the sum of its proper divisors (4360631).

13081881 is an equidigital number, since it uses as much as digits as its factorization.

13081881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4360630.

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 13081881 is about 3616.8883035007. Note that the first 3 decimals coincide. The cubic root of 13081881 is about 235.6261016584.

The spelling of 13081881 in words is "thirteen million, eighty-one thousand, eight hundred eighty-one".