285388321 has 2 divisors, whose sum is σ = 285388322. Its totient is φ = 285388320.

The previous prime is 285388319. The next prime is 285388343. The reversal of 285388321 is 123883582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167340096 + 118048225 = 12936^2 + 10865^2 .

It is a cyclic number.

It is not a de Polignac number, because 285388321 - 2¹ = 285388319 is a prime.

Together with 285388319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (285388361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142694160 + 142694161.

It is an arithmetic number, because the mean of its divisors is an integer number (142694161).

Almost surely, 2^285388321 is an apocalyptic number.

It is an amenable number.

285388321 is a deficient number, since it is larger than the sum of its proper divisors (1).

285388321 is an equidigital number, since it uses as much as digits as its factorization.

285388321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 40.

The square root of 285388321 is about 16893.4401765893. The cubic root of 285388321 is about 658.3831874368.

The spelling of 285388321 in words is "two hundred eighty-five million, three hundred eighty-eight thousand, three hundred twenty-one".