1721306708741 has 2 divisors, whose sum is σ = 1721306708742. Its totient is φ = 1721306708740.

The previous prime is 1721306708717. The next prime is 1721306708791. The reversal of 1721306708741 is 1478076031271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1576918108516 + 144388600225 = 1255754^2 + 379985^2 .

It is a cyclic number.

It is not a de Polignac number, because 1721306708741 - 2⁶ = 1721306708677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1721306708791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860653354370 + 860653354371.

It is an arithmetic number, because the mean of its divisors is an integer number (860653354371).

Almost surely, 2^{1721306708741} is an apocalyptic number.

It is an amenable number.

1721306708741 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721306708741 is an equidigital number, since it uses as much as digits as its factorization.

1721306708741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 47.

The spelling of 1721306708741 in words is "one trillion, seven hundred twenty-one billion, three hundred six million, seven hundred eight thousand, seven hundred forty-one".