285306409 has 2 divisors, whose sum is σ = 285306410. Its totient is φ = 285306408.

The previous prime is 285306407. The next prime is 285306457. The reversal of 285306409 is 904603582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268042384 + 17264025 = 16372^2 + 4155^2 .

It is a cyclic number.

It is not a de Polignac number, because 285306409 - 2¹ = 285306407 is a prime.

Together with 285306407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (285306407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142653204 + 142653205.

It is an arithmetic number, because the mean of its divisors is an integer number (142653205).

Almost surely, 2^285306409 is an apocalyptic number.

It is an amenable number.

285306409 is a deficient number, since it is larger than the sum of its proper divisors (1).

285306409 is an equidigital number, since it uses as much as digits as its factorization.

285306409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 285306409 is about 16891.0156296180. The cubic root of 285306409 is about 658.3201918152.

The spelling of 285306409 in words is "two hundred eighty-five million, three hundred six thousand, four hundred nine".