13521145 has 12 divisors (see below), whose sum is σ = 17835300. Its totient is φ = 9833120.

The previous prime is 13521139. The next prime is 13521149. The reversal of 13521145 is 54112531.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3415104 + 10106041 = 1848^2 + 3179^2 .

It is not a de Polignac number, because 13521145 - 2⁵ = 13521113 is a prime.

It is a super-2 number, since 2×13521145² = 365642724222050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13521149) 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 11 ways as a sum of consecutive naturals, for example, 10570 + ... + 11779.

It is an arithmetic number, because the mean of its divisors is an integer number (1486275).

Almost surely, 2^13521145 is an apocalyptic number.

It is an amenable number.

13521145 is a deficient number, since it is larger than the sum of its proper divisors (4314155).

13521145 is a wasteful number, since it uses less digits than its factorization.

13521145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22376 (or 22365 counting only the distinct ones).

The product of its digits is 600, while the sum is 22.

The square root of 13521145 is about 3677.1109583476. The cubic root of 13521145 is about 238.2344099653.

Adding to 13521145 its reverse (54112531), we get a palindrome (67633676).

The spelling of 13521145 in words is "thirteen million, five hundred twenty-one thousand, one hundred forty-five".