13172245 has 4 divisors (see below), whose sum is σ = 15806700. Its totient is φ = 10537792.

The previous prime is 13172239. The next prime is 13172251. The reversal of 13172245 is 54227131.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (13172239) and next prime (13172251).

It can be written as a sum of positive squares in 2 ways, for example, as 5560164 + 7612081 = 2358^2 + 2759^2 .

It is a cyclic number.

It is not a de Polignac number, because 13172245 - 2⁵ = 13172213 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1317220 + ... + 1317229.

It is an arithmetic number, because the mean of its divisors is an integer number (3951675).

Almost surely, 2^13172245 is an apocalyptic number.

It is an amenable number.

13172245 is a deficient number, since it is larger than the sum of its proper divisors (2634455).

13172245 is an equidigital number, since it uses as much as digits as its factorization.

13172245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2634454.

The product of its digits is 1680, while the sum is 25.

The square root of 13172245 is about 3629.3587587892. The cubic root of 13172245 is about 236.1673917765.

Adding to 13172245 its reverse (54227131), we get a palindrome (67399376).

The spelling of 13172245 in words is "thirteen million, one hundred seventy-two thousand, two hundred forty-five".