285916321 has 2 divisors, whose sum is σ = 285916322. Its totient is φ = 285916320.

The previous prime is 285916273. The next prime is 285916373. The reversal of 285916321 is 123619582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 146676321 + 139240000 = 12111^2 + 11800^2 .

It is a cyclic number.

It is not a de Polignac number, because 285916321 - 2¹⁵ = 285883553 is a prime.

It is a super-2 number, since 2×285916321² = 163496285228350082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (285910321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142958160 + 142958161.

It is an arithmetic number, because the mean of its divisors is an integer number (142958161).

Almost surely, 2^285916321 is an apocalyptic number.

It is an amenable number.

285916321 is a deficient number, since it is larger than the sum of its proper divisors (1).

285916321 is an equidigital number, since it uses as much as digits as its factorization.

285916321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 285916321 is about 16909.0603227974. The cubic root of 285916321 is about 658.7889645658.

The spelling of 285916321 in words is "two hundred eighty-five million, nine hundred sixteen thousand, three hundred twenty-one".