229781 has 2 divisors, whose sum is σ = 229782. Its totient is φ = 229780.

The previous prime is 229777. The next prime is 229799. The reversal of 229781 is 187922.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 167281 + 62500 = 409^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 229781 - 2² = 229777 is a prime.

It is a super-3 number, since 3×229781³ = 36396833347759623, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114890 + 114891.

It is an arithmetic number, because the mean of its divisors is an integer number (114891).

2²²⁹⁷⁸¹ is an apocalyptic number.

It is an amenable number.

229781 is a deficient number, since it is larger than the sum of its proper divisors (1).

229781 is an equidigital number, since it uses as much as digits as its factorization.

229781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 229781 is about 479.3547746711. The cubic root of 229781 is about 61.2498042476.

The spelling of 229781 in words is "two hundred twenty-nine thousand, seven hundred eighty-one".