13105881 has 20 divisors (see below), whose sum is σ = 20111652. Its totient is φ = 8499168.

The previous prime is 13105871. The next prime is 13105907. The reversal of 13105881 is 18850131.

It can be written as a sum of positive squares in 2 ways, for example, as 9865881 + 3240000 = 3141^2 + 1800^2 .

It is not a de Polignac number, because 13105881 - 2⁶ = 13105817 is a prime.

It is a super-2 number, since 2×13105881² = 343528233572322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13105811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 811 + ... + 5183.

Almost surely, 2^13105881 is an apocalyptic number.

It is an amenable number.

13105881 is a deficient number, since it is larger than the sum of its proper divisors (7005771).

13105881 is an equidigital number, since it uses as much as digits as its factorization.

13105881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4422 (or 4413 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 13105881 is about 3620.2045522318. The cubic root of 13105881 is about 235.7701067324.

The spelling of 13105881 in words is "thirteen million, one hundred five thousand, eight hundred eighty-one".