144532721 has 2 divisors, whose sum is σ = 144532722. Its totient is φ = 144532720.

The previous prime is 144532709. The next prime is 144532727. The reversal of 144532721 is 127235441.

144532721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143400625 + 1132096 = 11975^2 + 1064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144532721 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (144532727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72266360 + 72266361.

It is an arithmetic number, because the mean of its divisors is an integer number (72266361).

Almost surely, 2^144532721 is an apocalyptic number.

It is an amenable number.

144532721 is a deficient number, since it is larger than the sum of its proper divisors (1).

144532721 is an equidigital number, since it uses as much as digits as its factorization.

144532721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 29.

The square root of 144532721 is about 12022.1762173077. The cubic root of 144532721 is about 524.7938371173.

The spelling of 144532721 in words is "one hundred forty-four million, five hundred thirty-two thousand, seven hundred twenty-one".