1444721539 has 2 divisors, whose sum is σ = 1444721540. Its totient is φ = 1444721538.

The previous prime is 1444721527. The next prime is 1444721543. The reversal of 1444721539 is 9351274441.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1444721539 - 2¹⁷ = 1444590467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1444721519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722360769 + 722360770.

It is an arithmetic number, because the mean of its divisors is an integer number (722360770).

Almost surely, 2^1444721539 is an apocalyptic number.

1444721539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1444721539 is an equidigital number, since it uses as much as digits as its factorization.

1444721539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 40.

The square root of 1444721539 is about 38009.4927485227. The cubic root of 1444721539 is about 1130.4760932724.

The spelling of 1444721539 in words is "one billion, four hundred forty-four million, seven hundred twenty-one thousand, five hundred thirty-nine".