13138549 has 4 divisors (see below), whose sum is σ = 13155264. Its totient is φ = 13121836.

The previous prime is 13138529. The next prime is 13138561. The reversal of 13138549 is 94583131.

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 an emirpimes, since its reverse is a distinct semiprime: 94583131 = 1087 ⋅87013.

It is a cyclic number.

It is not a de Polignac number, because 13138549 - 2²¹ = 11041397 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 (13138529) 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, 7117 + ... + 8770.

It is an arithmetic number, because the mean of its divisors is an integer number (3288816).

Almost surely, 2^13138549 is an apocalyptic number.

It is an amenable number.

13138549 is a deficient number, since it is larger than the sum of its proper divisors (16715).

13138549 is an equidigital number, since it uses as much as digits as its factorization.

13138549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16714.

The product of its digits is 12960, while the sum is 34.

The square root of 13138549 is about 3624.7136438621. The cubic root of 13138549 is about 235.9658394010.

The spelling of 13138549 in words is "thirteen million, one hundred thirty-eight thousand, five hundred forty-nine".