285486821 has 2 divisors, whose sum is σ = 285486822. Its totient is φ = 285486820.

The previous prime is 285486767. The next prime is 285486823. The reversal of 285486821 is 128684582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285441025 + 45796 = 16895^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 285486821 - 2⁶ = 285486757 is a prime.

Together with 285486823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285486823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142743410 + 142743411.

It is an arithmetic number, because the mean of its divisors is an integer number (142743411).

Almost surely, 2^285486821 is an apocalyptic number.

It is an amenable number.

285486821 is a deficient number, since it is larger than the sum of its proper divisors (1).

285486821 is an equidigital number, since it uses as much as digits as its factorization.

285486821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 245760, while the sum is 44.

The square root of 285486821 is about 16896.3552578655. The cubic root of 285486821 is about 658.4589243418.

The spelling of 285486821 in words is "two hundred eighty-five million, four hundred eighty-six thousand, eight hundred twenty-one".