285516389 has 2 divisors, whose sum is σ = 285516390. Its totient is φ = 285516388.

The previous prime is 285516373. The next prime is 285516403. The reversal of 285516389 is 983615582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173791489 + 111724900 = 13183^2 + 10570^2 .

It is a cyclic number.

It is not a de Polignac number, because 285516389 - 2⁴ = 285516373 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 (285516289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142758194 + 142758195.

It is an arithmetic number, because the mean of its divisors is an integer number (142758195).

Almost surely, 2^285516389 is an apocalyptic number.

It is an amenable number.

285516389 is a deficient number, since it is larger than the sum of its proper divisors (1).

285516389 is an equidigital number, since it uses as much as digits as its factorization.

285516389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 47.

The square root of 285516389 is about 16897.2302168136. The cubic root of 285516389 is about 658.4816558539.

The spelling of 285516389 in words is "two hundred eighty-five million, five hundred sixteen thousand, three hundred eighty-nine".