13181449 has 4 divisors (see below), whose sum is σ = 13188736. Its totient is φ = 13174164.

The previous prime is 13181423. The next prime is 13181453. The reversal of 13181449 is 94418131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94418131 = 3359 ⋅28109.

It is a cyclic number.

It is not a de Polignac number, because 13181449 - 2¹¹ = 13179401 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13181449.

It is not an unprimeable number, because it can be changed into a prime (13181419) 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, 1372 + ... + 5314.

It is an arithmetic number, because the mean of its divisors is an integer number (3297184).

Almost surely, 2^13181449 is an apocalyptic number.

It is an amenable number.

13181449 is a deficient number, since it is larger than the sum of its proper divisors (7287).

13181449 is an equidigital number, since it uses as much as digits as its factorization.

13181449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7286.

The product of its digits is 3456, while the sum is 31.

The square root of 13181449 is about 3630.6265299532. The cubic root of 13181449 is about 236.2223856566. Note that the first 3 decimals are identical.

The spelling of 13181449 in words is "thirteen million, one hundred eighty-one thousand, four hundred forty-nine".