1720503913 has 2 divisors, whose sum is σ = 1720503914. Its totient is φ = 1720503912.

The previous prime is 1720503881. The next prime is 1720503919. The reversal of 1720503913 is 3193050271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1680016144 + 40487769 = 40988^2 + 6363^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720503913 - 2⁵ = 1720503881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1720503919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860251956 + 860251957.

It is an arithmetic number, because the mean of its divisors is an integer number (860251957).

Almost surely, 2^1720503913 is an apocalyptic number.

It is an amenable number.

1720503913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720503913 is an equidigital number, since it uses as much as digits as its factorization.

1720503913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 1720503913 is about 41478.9574724341. The cubic root of 1720503913 is about 1198.2622794968.

The spelling of 1720503913 in words is "one billion, seven hundred twenty million, five hundred three thousand, nine hundred thirteen".