285710989 has 2 divisors, whose sum is σ = 285710990. Its totient is φ = 285710988.

The previous prime is 285710917. The next prime is 285711017. The reversal of 285710989 is 989017582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 258148489 + 27562500 = 16067^2 + 5250^2 .

It is a cyclic number.

It is not a de Polignac number, because 285710989 - 2⁷ = 285710861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285716989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142855494 + 142855495.

It is an arithmetic number, because the mean of its divisors is an integer number (142855495).

Almost surely, 2^285710989 is an apocalyptic number.

It is an amenable number.

285710989 is a deficient number, since it is larger than the sum of its proper divisors (1).

285710989 is an equidigital number, since it uses as much as digits as its factorization.

285710989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 49.

The square root of 285710989 is about 16902.9875761653. The cubic root of 285710989 is about 658.6312227834.

The spelling of 285710989 in words is "two hundred eighty-five million, seven hundred ten thousand, nine hundred eighty-nine".