13549969 has 4 divisors (see below), whose sum is σ = 14347044. Its totient is φ = 12752896.

The previous prime is 13549961. The next prime is 13549973. The reversal of 13549969 is 96994531.

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 10810944 + 2739025 = 3288^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 13549969 - 2³ = 13549961 is a prime.

It is a super-2 number, since 2×13549969² = 367203319801922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13549961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398512 + ... + 398545.

It is an arithmetic number, because the mean of its divisors is an integer number (3586761).

Almost surely, 2^13549969 is an apocalyptic number.

It is an amenable number.

13549969 is a deficient number, since it is larger than the sum of its proper divisors (797075).

13549969 is an equidigital number, since it uses as much as digits as its factorization.

13549969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797074.

The product of its digits is 262440, while the sum is 46.

The square root of 13549969 is about 3681.0282530836. The cubic root of 13549969 is about 238.4035769718.

The spelling of 13549969 in words is "thirteen million, five hundred forty-nine thousand, nine hundred sixty-nine".