285226681 has 2 divisors, whose sum is σ = 285226682. Its totient is φ = 285226680.

The previous prime is 285226661. The next prime is 285226723. The reversal of 285226681 is 186622582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152769600 + 132457081 = 12360^2 + 11509^2 .

It is a cyclic number.

It is not a de Polignac number, because 285226681 - 2⁵ = 285226649 is a prime.

It is a super-2 number, since 2×285226681² = 162708519108551522, which contains 22 as substring.

It is equal to p_15494386 and since 285226681 and 15494386 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (285226621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142613340 + 142613341.

It is an arithmetic number, because the mean of its divisors is an integer number (142613341).

Almost surely, 2^285226681 is an apocalyptic number.

It is an amenable number.

285226681 is a deficient number, since it is larger than the sum of its proper divisors (1).

285226681 is an equidigital number, since it uses as much as digits as its factorization.

285226681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 40.

The square root of 285226681 is about 16888.6553934883. The cubic root of 285226681 is about 658.2588642501.

The spelling of 285226681 in words is "two hundred eighty-five million, two hundred twenty-six thousand, six hundred eighty-one".