285213391 has 2 divisors, whose sum is σ = 285213392. Its totient is φ = 285213390.

The previous prime is 285213377. The next prime is 285213407. The reversal of 285213391 is 193312582.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 285213391 - 2¹⁷ = 285082319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285213311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142606695 + 142606696.

It is an arithmetic number, because the mean of its divisors is an integer number (142606696).

Almost surely, 2^285213391 is an apocalyptic number.

285213391 is a deficient number, since it is larger than the sum of its proper divisors (1).

285213391 is an equidigital number, since it uses as much as digits as its factorization.

285213391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 285213391 is about 16888.2619295178. The cubic root of 285213391 is about 658.2486403396.

The spelling of 285213391 in words is "two hundred eighty-five million, two hundred thirteen thousand, three hundred ninety-one".