13531165 has 8 divisors (see below), whose sum is σ = 16544088. Its totient is φ = 10620480.

The previous prime is 13531163. The next prime is 13531171. The reversal of 13531165 is 56113531.

It can be written as a sum of positive squares in 4 ways, for example, as 142884 + 13388281 = 378^2 + 3659^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13531165 - 2¹ = 13531163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531163) 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 7 ways as a sum of consecutive naturals, for example, 25266 + ... + 25795.

It is an arithmetic number, because the mean of its divisors is an integer number (2068011).

Almost surely, 2^13531165 is an apocalyptic number.

It is an amenable number.

13531165 is a deficient number, since it is larger than the sum of its proper divisors (3012923).

13531165 is an equidigital number, since it uses as much as digits as its factorization.

13531165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51119.

The product of its digits is 1350, while the sum is 25.

The square root of 13531165 is about 3678.4731887021. The cubic root of 13531165 is about 238.2932442175.

Adding to 13531165 its reverse (56113531), we get a palindrome (69644696).

The spelling of 13531165 in words is "thirteen million, five hundred thirty-one thousand, one hundred sixty-five".