13172447 has 4 divisors (see below), whose sum is σ = 13179960. Its totient is φ = 13164936.

The previous prime is 13172441. The next prime is 13172473. The reversal of 13172447 is 74427131.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74427131 = 1103 ⋅67477.

It is a cyclic number.

It is not a de Polignac number, because 13172447 - 2¹⁴ = 13156063 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 (13172441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428 + ... + 5150.

It is an arithmetic number, because the mean of its divisors is an integer number (3294990).

Almost surely, 2^13172447 is an apocalyptic number.

13172447 is a deficient number, since it is larger than the sum of its proper divisors (7513).

13172447 is an equidigital number, since it uses as much as digits as its factorization.

13172447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7512.

The product of its digits is 4704, while the sum is 29.

The square root of 13172447 is about 3629.3865872899. The cubic root of 13172447 is about 236.1685990009.

Adding to 13172447 its reverse (74427131), we get a palindrome (87599578).

The spelling of 13172447 in words is "thirteen million, one hundred seventy-two thousand, four hundred forty-seven".