285285389 has 2 divisors, whose sum is σ = 285285390. Its totient is φ = 285285388.

The previous prime is 285285331. The next prime is 285285401. The reversal of 285285389 is 983582582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226502500 + 58782889 = 15050^2 + 7667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285285389 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 (285285089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142642694 + 142642695.

It is an arithmetic number, because the mean of its divisors is an integer number (142642695).

Almost surely, 2^285285389 is an apocalyptic number.

It is an amenable number.

285285389 is a deficient number, since it is larger than the sum of its proper divisors (1).

285285389 is an equidigital number, since it uses as much as digits as its factorization.

285285389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382400, while the sum is 50.

The square root of 285285389 is about 16890.3933938793. The cubic root of 285285389 is about 658.3040241327.

The spelling of 285285389 in words is "two hundred eighty-five million, two hundred eighty-five thousand, three hundred eighty-nine".