520780609 has 2 divisors, whose sum is σ = 520780610. Its totient is φ = 520780608.

The previous prime is 520780583. The next prime is 520780619. The reversal of 520780609 is 906087025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 410467600 + 110313009 = 20260^2 + 10503^2 .

It is a cyclic number.

It is not a de Polignac number, because 520780609 - 2²¹ = 518683457 is a prime.

It is not a weakly prime, because it can be changed into another prime (520780619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260390304 + 260390305.

It is an arithmetic number, because the mean of its divisors is an integer number (260390305).

Almost surely, 2^520780609 is an apocalyptic number.

It is an amenable number.

520780609 is a deficient number, since it is larger than the sum of its proper divisors (1).

520780609 is an equidigital number, since it uses as much as digits as its factorization.

520780609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 520780609 is about 22820.6180678789. The cubic root of 520780609 is about 804.5473370370.

The spelling of 520780609 in words is "five hundred twenty million, seven hundred eighty thousand, six hundred nine".