144221309 has 2 divisors, whose sum is σ = 144221310. Its totient is φ = 144221308.

The previous prime is 144221303. The next prime is 144221317. The reversal of 144221309 is 903122441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92064025 + 52157284 = 9595^2 + 7222^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144221309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144221303) 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 as a sum of consecutive naturals, namely, 72110654 + 72110655.

It is an arithmetic number, because the mean of its divisors is an integer number (72110655).

Almost surely, 2^144221309 is an apocalyptic number.

It is an amenable number.

144221309 is a deficient number, since it is larger than the sum of its proper divisors (1).

144221309 is an equidigital number, since it uses as much as digits as its factorization.

144221309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 144221309 is about 12009.2176681081. The cubic root of 144221309 is about 524.4166569835.

The spelling of 144221309 in words is "one hundred forty-four million, two hundred twenty-one thousand, three hundred nine".