285284309 has 2 divisors, whose sum is σ = 285284310. Its totient is φ = 285284308.

The previous prime is 285284287. The next prime is 285284323. The reversal of 285284309 is 903482582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 281501284 + 3783025 = 16778^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 285284309 - 2⁸ = 285284053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285284369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142642154 + 142642155.

It is an arithmetic number, because the mean of its divisors is an integer number (142642155).

Almost surely, 2^285284309 is an apocalyptic number.

It is an amenable number.

285284309 is a deficient number, since it is larger than the sum of its proper divisors (1).

285284309 is an equidigital number, since it uses as much as digits as its factorization.

285284309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 285284309 is about 16890.3614230128. The cubic root of 285284309 is about 658.3031934216.

The spelling of 285284309 in words is "two hundred eighty-five million, two hundred eighty-four thousand, three hundred nine".