1720452505 has 4 divisors (see below), whose sum is σ = 2064543012. Its totient is φ = 1376362000.

The previous prime is 1720452499. The next prime is 1720452541. The reversal of 1720452505 is 5052540271.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1222761024 + 497691481 = 34968^2 + 22309^2 .

It is not a de Polignac number, because 1720452505 - 2¹⁷ = 1720321433 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 172045246 + ... + 172045255.

It is an arithmetic number, because the mean of its divisors is an integer number (516135753).

Almost surely, 2^1720452505 is an apocalyptic number.

It is an amenable number.

1720452505 is a deficient number, since it is larger than the sum of its proper divisors (344090507).

1720452505 is an equidigital number, since it uses as much as digits as its factorization.

1720452505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344090506.

The product of its (nonzero) digits is 14000, while the sum is 31.

The square root of 1720452505 is about 41478.3377800991. The cubic root of 1720452505 is about 1198.2503448381.

Adding to 1720452505 its reverse (5052540271), we get a palindrome (6772992776).

The spelling of 1720452505 in words is "one billion, seven hundred twenty million, four hundred fifty-two thousand, five hundred five".