1720231522729 has 2 divisors, whose sum is σ = 1720231522730. Its totient is φ = 1720231522728.

The previous prime is 1720231522717. The next prime is 1720231522753. The reversal of 1720231522729 is 9272251320271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1650826674025 + 69404848704 = 1284845^2 + 263448^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720231522729 - 2¹⁹ = 1720230998441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1720231526729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860115761364 + 860115761365.

It is an arithmetic number, because the mean of its divisors is an integer number (860115761365).

Almost surely, 2^{1720231522729} is an apocalyptic number.

It is an amenable number.

1720231522729 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720231522729 is an equidigital number, since it uses as much as digits as its factorization.

1720231522729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 1720231522729 in words is "one trillion, seven hundred twenty billion, two hundred thirty-one million, five hundred twenty-two thousand, seven hundred twenty-nine".