285320143 has 2 divisors, whose sum is σ = 285320144. Its totient is φ = 285320142.

The previous prime is 285320117. The next prime is 285320251. The reversal of 285320143 is 341023582.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285320143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285320443) 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, 142660071 + 142660072.

It is an arithmetic number, because the mean of its divisors is an integer number (142660072).

Almost surely, 2^285320143 is an apocalyptic number.

285320143 is a deficient number, since it is larger than the sum of its proper divisors (1).

285320143 is an equidigital number, since it uses as much as digits as its factorization.

285320143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 285320143 is about 16891.4221722151. The cubic root of 285320143 is about 658.3307549900.

The spelling of 285320143 in words is "two hundred eighty-five million, three hundred twenty thousand, one hundred forty-three".