1444764721 has 2 divisors, whose sum is σ = 1444764722. Its totient is φ = 1444764720.

The previous prime is 1444764691. The next prime is 1444764817. The reversal of 1444764721 is 1274674441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1140750625 + 304014096 = 33775^2 + 17436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1444764721 - 2⁷ = 1444764593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1444764421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722382360 + 722382361.

It is an arithmetic number, because the mean of its divisors is an integer number (722382361).

Almost surely, 2^1444764721 is an apocalyptic number.

It is an amenable number.

1444764721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1444764721 is an equidigital number, since it uses as much as digits as its factorization.

1444764721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 150528, while the sum is 40.

The square root of 1444764721 is about 38010.0607865865. The cubic root of 1444764721 is about 1130.4873562807.

The spelling of 1444764721 in words is "one billion, four hundred forty-four million, seven hundred sixty-four thousand, seven hundred twenty-one".