285355289 has 2 divisors, whose sum is σ = 285355290. Its totient is φ = 285355288.

The previous prime is 285355253. The next prime is 285355307. The reversal of 285355289 is 982553582.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285339664 + 15625 = 16892^2 + 125^2 .

It is a cyclic number.

It is not a de Polignac number, because 285355289 - 2⁸ = 285355033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (285352289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142677644 + 142677645.

It is an arithmetic number, because the mean of its divisors is an integer number (142677645).

Almost surely, 2^285355289 is an apocalyptic number.

It is an amenable number.

285355289 is a deficient number, since it is larger than the sum of its proper divisors (1).

285355289 is an equidigital number, since it uses as much as digits as its factorization.

285355289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864000, while the sum is 47.

The square root of 285355289 is about 16892.4624907087. The cubic root of 285355289 is about 658.3577851446.

The spelling of 285355289 in words is "two hundred eighty-five million, three hundred fifty-five thousand, two hundred eighty-nine".