285599989 has 2 divisors, whose sum is σ = 285599990. Its totient is φ = 285599988.

The previous prime is 285599969. The next prime is 285599999. The reversal of 285599989 is 989995582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223741764 + 61858225 = 14958^2 + 7865^2 .

It is a cyclic number.

It is not a de Polignac number, because 285599989 - 2⁵ = 285599957 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 285599989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285599959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142799994 + 142799995.

It is an arithmetic number, because the mean of its divisors is an integer number (142799995).

Almost surely, 2^285599989 is an apocalyptic number.

It is an amenable number.

285599989 is a deficient number, since it is larger than the sum of its proper divisors (1).

285599989 is an equidigital number, since it uses as much as digits as its factorization.

285599989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20995200, while the sum is 64.

The square root of 285599989 is about 16899.7038139726. The cubic root of 285599989 is about 658.5459180078.

The spelling of 285599989 in words is "two hundred eighty-five million, five hundred ninety-nine thousand, nine hundred eighty-nine".