285581089 has 2 divisors, whose sum is σ = 285581090. Its totient is φ = 285581088.

The previous prime is 285581069. The next prime is 285581111. The reversal of 285581089 is 980185582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 260661025 + 24920064 = 16145^2 + 4992^2 .

It is a cyclic number.

It is not a de Polignac number, because 285581089 - 2⁵ = 285581057 is a prime.

It is not a weakly prime, because it can be changed into another prime (285581029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142790544 + 142790545.

It is an arithmetic number, because the mean of its divisors is an integer number (142790545).

Almost surely, 2^285581089 is an apocalyptic number.

It is an amenable number.

285581089 is a deficient number, since it is larger than the sum of its proper divisors (1).

285581089 is an equidigital number, since it uses as much as digits as its factorization.

285581089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 46.

The square root of 285581089 is about 16899.1446233234. The cubic root of 285581089 is about 658.5313909386.

The spelling of 285581089 in words is "two hundred eighty-five million, five hundred eighty-one thousand, eighty-nine".