284889391 has 2 divisors, whose sum is σ = 284889392. Its totient is φ = 284889390.

The previous prime is 284889389. The next prime is 284889403. The reversal of 284889391 is 193988482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 284889391 - 2¹ = 284889389 is a prime.

Together with 284889389, 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 (284889331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142444695 + 142444696.

It is an arithmetic number, because the mean of its divisors is an integer number (142444696).

Almost surely, 2^284889391 is an apocalyptic number.

284889391 is a deficient number, since it is larger than the sum of its proper divisors (1).

284889391 is an equidigital number, since it uses as much as digits as its factorization.

284889391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 52.

The square root of 284889391 is about 16878.6667423704. Note that the first 3 decimals coincide. The cubic root of 284889391 is about 657.9992909334. Note that the first 3 decimals are identical.

Subtracting from 284889391 its reverse (193988482), we obtain a palindrome (90900909).

The spelling of 284889391 in words is "two hundred eighty-four million, eight hundred eighty-nine thousand, three hundred ninety-one".