520023709 has 2 divisors, whose sum is σ = 520023710. Its totient is φ = 520023708.

The previous prime is 520023703. The next prime is 520023739. The reversal of 520023709 is 907320025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359292025 + 160731684 = 18955^2 + 12678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520023709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520023703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260011854 + 260011855.

It is an arithmetic number, because the mean of its divisors is an integer number (260011855).

Almost surely, 2^520023709 is an apocalyptic number.

It is an amenable number.

520023709 is a deficient number, since it is larger than the sum of its proper divisors (1).

520023709 is an equidigital number, since it uses as much as digits as its factorization.

520023709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 520023709 is about 22804.0283502718. The cubic root of 520023709 is about 804.1573729919.

The spelling of 520023709 in words is "five hundred twenty million, twenty-three thousand, seven hundred nine".