285812869 has 2 divisors, whose sum is σ = 285812870. Its totient is φ = 285812868.

The previous prime is 285812851. The next prime is 285812921. The reversal of 285812869 is 968218582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168350625 + 117462244 = 12975^2 + 10838^2 .

It is a cyclic number.

It is not a de Polignac number, because 285812869 - 2⁵ = 285812837 is a prime.

It is a super-2 number, since 2×285812869² = 163377992172022322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285812809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142906434 + 142906435.

It is an arithmetic number, because the mean of its divisors is an integer number (142906435).

Almost surely, 2^285812869 is an apocalyptic number.

It is an amenable number.

285812869 is a deficient number, since it is larger than the sum of its proper divisors (1).

285812869 is an equidigital number, since it uses as much as digits as its factorization.

285812869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 49.

The square root of 285812869 is about 16906.0009759848. Note that the first 3 decimals coincide. The cubic root of 285812869 is about 658.7094992905.

The spelling of 285812869 in words is "two hundred eighty-five million, eight hundred twelve thousand, eight hundred sixty-nine".