144809281 has 8 divisors (see below), whose sum is σ = 153549864. Its totient is φ = 136093440.

The previous prime is 144809261. The next prime is 144809309. The reversal of 144809281 is 182908441.

It can be written as a sum of positive squares in 4 ways, for example, as 46799281 + 98010000 = 6841^2 + 9900^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 144809281 - 2²⁵ = 111254849 is a prime.

It is a super-2 number, since 2×144809281² = 41939455727473922, which contains 22 as substring.

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 144809281.

It is not an unprimeable number, because it can be changed into a prime (144809201) 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 7 ways as a sum of consecutive naturals, for example, 6651 + ... + 18271.

It is an arithmetic number, because the mean of its divisors is an integer number (19193733).

Almost surely, 2^144809281 is an apocalyptic number.

It is an amenable number.

144809281 is a deficient number, since it is larger than the sum of its proper divisors (8740583).

144809281 is a wasteful number, since it uses less digits than its factorization.

144809281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12371.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 144809281 is about 12033.6727976125. The cubic root of 144809281 is about 525.1283507803.

The spelling of 144809281 in words is "one hundred forty-four million, eight hundred nine thousand, two hundred eighty-one".