285055681 has 2 divisors, whose sum is σ = 285055682. Its totient is φ = 285055680.

The previous prime is 285055679. The next prime is 285055717. The reversal of 285055681 is 186550582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235929600 + 49126081 = 15360^2 + 7009^2 .

It is a cyclic number.

It is not a de Polignac number, because 285055681 - 2¹ = 285055679 is a prime.

It is a super-2 number, since 2×285055681² = 162513482540747522, which contains 22 as substring.

Together with 285055679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (285055481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142527840 + 142527841.

It is an arithmetic number, because the mean of its divisors is an integer number (142527841).

Almost surely, 2^285055681 is an apocalyptic number.

It is an amenable number.

285055681 is a deficient number, since it is larger than the sum of its proper divisors (1).

285055681 is an equidigital number, since it uses as much as digits as its factorization.

285055681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96000, while the sum is 40.

The square root of 285055681 is about 16883.5920644868. The cubic root of 285055681 is about 658.1272908089.

The spelling of 285055681 in words is "two hundred eighty-five million, fifty-five thousand, six hundred eighty-one".