13172545 has 4 divisors (see below), whose sum is σ = 15807060. Its totient is φ = 10538032.

The previous prime is 13172543. The next prime is 13172563. The reversal of 13172545 is 54527131.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8433216 + 4739329 = 2904^2 + 2177^2 .

It is a cyclic number.

It is not a de Polignac number, because 13172545 - 2¹ = 13172543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13172543) 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 3 ways as a sum of consecutive naturals, for example, 1317250 + ... + 1317259.

It is an arithmetic number, because the mean of its divisors is an integer number (3951765).

Almost surely, 2^13172545 is an apocalyptic number.

It is an amenable number.

13172545 is a deficient number, since it is larger than the sum of its proper divisors (2634515).

13172545 is an equidigital number, since it uses as much as digits as its factorization.

13172545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634514.

The product of its digits is 4200, while the sum is 28.

The square root of 13172545 is about 3629.4000881688. The cubic root of 13172545 is about 236.1691846796.

Adding to 13172545 its reverse (54527131), we get a palindrome (67699676).

The spelling of 13172545 in words is "thirteen million, one hundred seventy-two thousand, five hundred forty-five".