65531444 has 12 divisors (see below), whose sum is σ = 125105568. Its totient is φ = 29787000.

The previous prime is 65531429. The next prime is 65531461. The reversal of 65531444 is 44413556.

It is a self number, because there is not a number n which added to its sum of digits gives 65531444.

It is a congruent number.

It is an unprimeable number.

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, 744632 + ... + 744719.

It is an arithmetic number, because the mean of its divisors is an integer number (10425464).

Almost surely, 2^65531444 is an apocalyptic number.

It is an amenable number.

65531444 is a deficient number, since it is larger than the sum of its proper divisors (59574124).

65531444 is a wasteful number, since it uses less digits than its factorization.

65531444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489366 (or 1489364 counting only the distinct ones).

The product of its digits is 28800, while the sum is 32.

The square root of 65531444 is about 8095.1494118392. The cubic root of 65531444 is about 403.1653929759.

It can be divided in two parts, 6553 and 1444, that added together give a palindrome (7997).

The spelling of 65531444 in words is "sixty-five million, five hundred thirty-one thousand, four hundred forty-four".