285305233 has 2 divisors, whose sum is σ = 285305234. Its totient is φ = 285305232.

The previous prime is 285305221. The next prime is 285305239. The reversal of 285305233 is 332503582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202549824 + 82755409 = 14232^2 + 9097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285305233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 285305195 and 285305204.

It is not a weakly prime, because it can be changed into another prime (285305239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142652616 + 142652617.

It is an arithmetic number, because the mean of its divisors is an integer number (142652617).

Almost surely, 2^285305233 is an apocalyptic number.

It is an amenable number.

285305233 is a deficient number, since it is larger than the sum of its proper divisors (1).

285305233 is an equidigital number, since it uses as much as digits as its factorization.

285305233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 285305233 is about 16890.9808181763. The cubic root of 285305233 is about 658.3192873074.

The spelling of 285305233 in words is "two hundred eighty-five million, three hundred five thousand, two hundred thirty-three".