1720001329 has 2 divisors, whose sum is σ = 1720001330. Its totient is φ = 1720001328.

The previous prime is 1720001279. The next prime is 1720001407. The reversal of 1720001329 is 9231000271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1495600929 + 224400400 = 38673^2 + 14980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720001329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1720001029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860000664 + 860000665.

It is an arithmetic number, because the mean of its divisors is an integer number (860000665).

Almost surely, 2^1720001329 is an apocalyptic number.

It is an amenable number.

1720001329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720001329 is an equidigital number, since it uses as much as digits as its factorization.

1720001329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 1720001329 is about 41472.8987291701. The cubic root of 1720001329 is about 1198.1455915710.

The spelling of 1720001329 in words is "one billion, seven hundred twenty million, one thousand, three hundred twenty-nine".