285000509 has 2 divisors, whose sum is σ = 285000510. Its totient is φ = 285000508.

The previous prime is 285000497. The next prime is 285000619. The reversal of 285000509 is 905000582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237252409 + 47748100 = 15403^2 + 6910^2 .

It is a cyclic number.

It is not a de Polignac number, because 285000509 - 2⁴ = 285000493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285000409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142500254 + 142500255.

It is an arithmetic number, because the mean of its divisors is an integer number (142500255).

Almost surely, 2^285000509 is an apocalyptic number.

It is an amenable number.

285000509 is a deficient number, since it is larger than the sum of its proper divisors (1).

285000509 is an equidigital number, since it uses as much as digits as its factorization.

285000509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 285000509 is about 16881.9580914063. The cubic root of 285000509 is about 658.0848282958.

The spelling of 285000509 in words is "two hundred eighty-five million, five hundred nine", and thus it is an aban number.