13505131 has 4 divisors (see below), whose sum is σ = 13546264. Its totient is φ = 13464000.

The previous prime is 13505099. The next prime is 13505137. The reversal of 13505131 is 13150531.

13505131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13505131 - 2⁵ = 13505099 is a prime.

It is a super-2 number, since 2×13505131² = 364777126654322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13505099 and 13505108.

It is not an unprimeable number, because it can be changed into a prime (13505137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20070 + ... + 20731.

It is an arithmetic number, because the mean of its divisors is an integer number (3386566).

Almost surely, 2^13505131 is an apocalyptic number.

13505131 is a deficient number, since it is larger than the sum of its proper divisors (41133).

13505131 is an equidigital number, since it uses as much as digits as its factorization.

13505131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41132.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 13505131 is about 3674.9327885010. The cubic root of 13505131 is about 238.1403204735.

Adding to 13505131 its reverse (13150531), we get a palindrome (26655662).

The spelling of 13505131 in words is "thirteen million, five hundred five thousand, one hundred thirty-one".