13781135 has 16 divisors (see below), whose sum is σ = 17620416. Its totient is φ = 10311168.

The previous prime is 13781129. The next prime is 13781149. The reversal of 13781135 is 53118731.

It is a cyclic number.

It is not a de Polignac number, because 13781135 - 2¹² = 13777039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13781098 and 13781107.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 16334 + ... + 17156.

It is an arithmetic number, because the mean of its divisors is an integer number (1101276).

Almost surely, 2^13781135 is an apocalyptic number.

13781135 is a deficient number, since it is larger than the sum of its proper divisors (3839281).

13781135 is a wasteful number, since it uses less digits than its factorization.

13781135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042.

The product of its digits is 2520, while the sum is 29.

The square root of 13781135 is about 3712.2951121914. The cubic root of 13781135 is about 239.7516818214.

Adding to 13781135 its reverse (53118731), we get a palindrome (66899866).

The spelling of 13781135 in words is "thirteen million, seven hundred eighty-one thousand, one hundred thirty-five".