285072209 has 2 divisors, whose sum is σ = 285072210. Its totient is φ = 285072208.

The previous prime is 285072191. The next prime is 285072239. The reversal of 285072209 is 902270582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 283181584 + 1890625 = 16828^2 + 1375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285072209 is a prime.

It is not a weakly prime, because it can be changed into another prime (285072239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142536104 + 142536105.

It is an arithmetic number, because the mean of its divisors is an integer number (142536105).

Almost surely, 2^285072209 is an apocalyptic number.

It is an amenable number.

285072209 is a deficient number, since it is larger than the sum of its proper divisors (1).

285072209 is an equidigital number, since it uses as much as digits as its factorization.

285072209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 285072209 is about 16884.0815266925. The cubic root of 285072209 is about 658.1400103328.

The spelling of 285072209 in words is "two hundred eighty-five million, seventy-two thousand, two hundred nine".