144891209 has 4 divisors (see below), whose sum is σ = 148260816. Its totient is φ = 141521604.

The previous prime is 144891157. The next prime is 144891217. The reversal of 144891209 is 902198441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144891209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144891239) 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 3 ways as a sum of consecutive naturals, for example, 1684739 + ... + 1684824.

It is an arithmetic number, because the mean of its divisors is an integer number (37065204).

Almost surely, 2^144891209 is an apocalyptic number.

It is an amenable number.

144891209 is a deficient number, since it is larger than the sum of its proper divisors (3369607).

144891209 is an equidigital number, since it uses as much as digits as its factorization.

144891209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3369606.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 144891209 is about 12037.0764307617. The cubic root of 144891209 is about 525.2273651625.

The spelling of 144891209 in words is "one hundred forty-four million, eight hundred ninety-one thousand, two hundred nine".