1732705721 has 2 divisors, whose sum is σ = 1732705722. Its totient is φ = 1732705720.

The previous prime is 1732705679. The next prime is 1732705753. The reversal of 1732705721 is 1275072371.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1417146025 + 315559696 = 37645^2 + 17764^2 .

It is a cyclic number.

It is not a de Polignac number, because 1732705721 - 2¹⁰ = 1732704697 is a prime.

It is a super-2 number, since 2×1732705721² = 6004538231172259682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1732705321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 866352860 + 866352861.

It is an arithmetic number, because the mean of its divisors is an integer number (866352861).

Almost surely, 2^1732705721 is an apocalyptic number.

It is an amenable number.

1732705721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1732705721 is an equidigital number, since it uses as much as digits as its factorization.

1732705721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 1732705721 is about 41625.7819265897. The cubic root of 1732705721 is about 1201.0882999728.

The spelling of 1732705721 in words is "one billion, seven hundred thirty-two million, seven hundred five thousand, seven hundred twenty-one".