285056557 has 2 divisors, whose sum is σ = 285056558. Its totient is φ = 285056556.

The previous prime is 285056543. The next prime is 285056581. The reversal of 285056557 is 755650582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264680361 + 20376196 = 16269^2 + 4514^2 .

It is a cyclic number.

It is not a de Polignac number, because 285056557 - 2¹⁵ = 285023789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285056507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142528278 + 142528279.

It is an arithmetic number, because the mean of its divisors is an integer number (142528279).

Almost surely, 2^285056557 is an apocalyptic number.

It is an amenable number.

285056557 is a deficient number, since it is larger than the sum of its proper divisors (1).

285056557 is an equidigital number, since it uses as much as digits as its factorization.

285056557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420000, while the sum is 43.

The square root of 285056557 is about 16883.6180068136. The cubic root of 285056557 is about 658.1279649683.

The spelling of 285056557 in words is "two hundred eighty-five million, fifty-six thousand, five hundred fifty-seven".