144721729 has 2 divisors, whose sum is σ = 144721730. Its totient is φ = 144721728.

The previous prime is 144721721. The next prime is 144721739. The reversal of 144721729 is 927127441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144600625 + 121104 = 12025^2 + 348^2 .

It is a cyclic number.

It is not a de Polignac number, because 144721729 - 2³ = 144721721 is a prime.

It is not a weakly prime, because it can be changed into another prime (144721721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72360864 + 72360865.

It is an arithmetic number, because the mean of its divisors is an integer number (72360865).

Almost surely, 2^144721729 is an apocalyptic number.

It is an amenable number.

144721729 is a deficient number, since it is larger than the sum of its proper divisors (1).

144721729 is an equidigital number, since it uses as much as digits as its factorization.

144721729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 37.

The square root of 144721729 is about 12030.0344554785. The cubic root of 144721729 is about 525.0224982044.

The spelling of 144721729 in words is "one hundred forty-four million, seven hundred twenty-one thousand, seven hundred twenty-nine".