1720507313 has 16 divisors (see below), whose sum is σ = 2026370304. Its totient is φ = 1430096640.

The previous prime is 1720507303. The next prime is 1720507337. The reversal of 1720507313 is 3137050271.

It is not a de Polignac number, because 1720507313 - 2¹² = 1720503217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1720507303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29981 + ... + 65877.

It is an arithmetic number, because the mean of its divisors is an integer number (126648144).

Almost surely, 2^1720507313 is an apocalyptic number.

It is an amenable number.

1720507313 is a deficient number, since it is larger than the sum of its proper divisors (305862991).

1720507313 is a wasteful number, since it uses less digits than its factorization.

1720507313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36112.

The product of its (nonzero) digits is 4410, while the sum is 29.

The square root of 1720507313 is about 41478.9984570505. The cubic root of 1720507313 is about 1198.2630688177.

Adding to 1720507313 its reverse (3137050271), we get a palindrome (4857557584).

The spelling of 1720507313 in words is "one billion, seven hundred twenty million, five hundred seven thousand, three hundred thirteen".