285855919 has 2 divisors, whose sum is σ = 285855920. Its totient is φ = 285855918.

The previous prime is 285855917. The next prime is 285855971. The reversal of 285855919 is 919558582.

It is an a-pointer prime, because the next prime (285855971) can be obtained adding 285855919 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 285855919 - 2¹ = 285855917 is a prime.

It is a super-2 number, since 2×285855919² = 163427212854669122, which contains 22 as substring.

Together with 285855917, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285855917) 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, 142927959 + 142927960.

It is an arithmetic number, because the mean of its divisors is an integer number (142927960).

Almost surely, 2^285855919 is an apocalyptic number.

285855919 is a deficient number, since it is larger than the sum of its proper divisors (1).

285855919 is an equidigital number, since it uses as much as digits as its factorization.

285855919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296000, while the sum is 52.

The square root of 285855919 is about 16907.2741445805. The cubic root of 285855919 is about 658.7425699035.

The spelling of 285855919 in words is "two hundred eighty-five million, eight hundred fifty-five thousand, nine hundred nineteen".