144842009 has 4 divisors (see below), whose sum is σ = 155983716. Its totient is φ = 133700304.

The previous prime is 144841993. The next prime is 144842041. The reversal of 144842009 is 900248441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 900248441 = 587 ⋅1533643.

It can be written as a sum of positive squares in 2 ways, for example, as 21187609 + 123654400 = 4603^2 + 11120^2 .

It is a cyclic number.

It is not a de Polignac number, because 144842009 - 2⁴ = 144841993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (144842099) 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, 5570834 + ... + 5570859.

It is an arithmetic number, because the mean of its divisors is an integer number (38995929).

Almost surely, 2^144842009 is an apocalyptic number.

It is an amenable number.

144842009 is a deficient number, since it is larger than the sum of its proper divisors (11141707).

144842009 is a wasteful number, since it uses less digits than its factorization.

144842009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11141706.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 144842009 is about 12035.0325716219. The cubic root of 144842009 is about 525.1679088021.

The spelling of 144842009 in words is "one hundred forty-four million, eight hundred forty-two thousand, nine".