13551444 has 36 divisors (see below), whose sum is σ = 34387444. Its totient is φ = 4499712.

The previous prime is 13551437. The next prime is 13551449. The reversal of 13551444 is 44415531.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1855044 + 11696400 = 1362^2 + 3420^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13551449) 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 11 ways as a sum of consecutive naturals, for example, 11574 + ... + 12690.

Almost surely, 2^13551444 is an apocalyptic number.

It is an amenable number.

13551444 is an abundant number, since it is smaller than the sum of its proper divisors (20836000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13551444 is a wasteful number, since it uses less digits than its factorization.

13551444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464 (or 1459 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 13551444 is about 3681.2285992587. The cubic root of 13551444 is about 238.4122272380.

Adding to 13551444 its reverse (44415531), we get a palindrome (57966975).

The spelling of 13551444 in words is "thirteen million, five hundred fifty-one thousand, four hundred forty-four".