144720689 has 2 divisors, whose sum is σ = 144720690. Its totient is φ = 144720688.

The previous prime is 144720683. The next prime is 144720703. The reversal of 144720689 is 986027441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95257600 + 49463089 = 9760^2 + 7033^2 .

It is a cyclic number.

It is not a de Polignac number, because 144720689 - 2⁴ = 144720673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (144720683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72360344 + 72360345.

It is an arithmetic number, because the mean of its divisors is an integer number (72360345).

Almost surely, 2^144720689 is an apocalyptic number.

It is an amenable number.

144720689 is a deficient number, since it is larger than the sum of its proper divisors (1).

144720689 is an equidigital number, since it uses as much as digits as its factorization.

144720689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 144720689 is about 12029.9912302545. The cubic root of 144720689 is about 525.0212405616.

The spelling of 144720689 in words is "one hundred forty-four million, seven hundred twenty thousand, six hundred eighty-nine".