13243145 has 4 divisors (see below), whose sum is σ = 15891780. Its totient is φ = 10594512.

The previous prime is 13243141. The next prime is 13243157. The reversal of 13243145 is 54134231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54134231 = 307 ⋅176333.

It can be written as a sum of positive squares in 2 ways, for example, as 4338889 + 8904256 = 2083^2 + 2984^2 .

It is a cyclic number.

It is not a de Polignac number, because 13243145 - 2² = 13243141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13243145.

It is not an unprimeable number, because it can be changed into a prime (13243141) 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, 1324310 + ... + 1324319.

It is an arithmetic number, because the mean of its divisors is an integer number (3972945).

Almost surely, 2^13243145 is an apocalyptic number.

It is an amenable number.

13243145 is a deficient number, since it is larger than the sum of its proper divisors (2648635).

13243145 is an equidigital number, since it uses as much as digits as its factorization.

13243145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648634.

The product of its digits is 1440, while the sum is 23.

The square root of 13243145 is about 3639.1132161558. The cubic root of 13243145 is about 236.5903598030.

Adding to 13243145 its reverse (54134231), we get a palindrome (67377376).

The spelling of 13243145 in words is "thirteen million, two hundred forty-three thousand, one hundred forty-five".