1439444362721 has 2 divisors, whose sum is σ = 1439444362722. Its totient is φ = 1439444362720.

The previous prime is 1439444362691. The next prime is 1439444362781. The reversal of 1439444362721 is 1272634449341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1380305418496 + 59138944225 = 1174864^2 + 243185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1439444362721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1439444362721.

It is not a weakly prime, because it can be changed into another prime (1439444362781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 719722181360 + 719722181361.

It is an arithmetic number, because the mean of its divisors is an integer number (719722181361).

Almost surely, 2^{1439444362721} is an apocalyptic number.

It is an amenable number.

1439444362721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1439444362721 is an equidigital number, since it uses as much as digits as its factorization.

1439444362721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 50.

The spelling of 1439444362721 in words is "one trillion, four hundred thirty-nine billion, four hundred forty-four million, three hundred sixty-two thousand, seven hundred twenty-one".