501330509 has 2 divisors, whose sum is σ = 501330510. Its totient is φ = 501330508.

The previous prime is 501330499. The next prime is 501330617. The reversal of 501330509 is 905033105.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484968484 + 16362025 = 22022^2 + 4045^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-501330509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (501335509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250665254 + 250665255.

It is an arithmetic number, because the mean of its divisors is an integer number (250665255).

Almost surely, 2^501330509 is an apocalyptic number.

It is an amenable number.

501330509 is a deficient number, since it is larger than the sum of its proper divisors (1).

501330509 is an equidigital number, since it uses as much as digits as its factorization.

501330509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2025, while the sum is 26.

The square root of 501330509 is about 22390.4110949308. The cubic root of 501330509 is about 794.4039195670.

The spelling of 501330509 in words is "five hundred one million, three hundred thirty thousand, five hundred nine".