13538881 has 4 divisors (see below), whose sum is σ = 14127552. Its totient is φ = 12950212.

The previous prime is 13538879. The next prime is 13538923. The reversal of 13538881 is 18883531.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18883531 = 269 ⋅70199.

It is a cyclic number.

It is not a de Polignac number, because 13538881 - 2¹ = 13538879 is a prime.

It is a super-2 number, since 2×13538881² = 366602597464322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13538881.

It is not an unprimeable number, because it can be changed into a prime (13538821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294301 + ... + 294346.

It is an arithmetic number, because the mean of its divisors is an integer number (3531888).

Almost surely, 2^13538881 is an apocalyptic number.

It is an amenable number.

13538881 is a deficient number, since it is larger than the sum of its proper divisors (588671).

13538881 is an equidigital number, since it uses as much as digits as its factorization.

13538881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588670.

The product of its digits is 23040, while the sum is 37.

The square root of 13538881 is about 3679.5218439357. The cubic root of 13538881 is about 238.3385303228.

The spelling of 13538881 in words is "thirteen million, five hundred thirty-eight thousand, eight hundred eighty-one".