229681 has 2 divisors, whose sum is σ = 229682. Its totient is φ = 229680.

The previous prime is 229639. The next prime is 229693. The reversal of 229681 is 186922.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216225 + 13456 = 465^2 + 116^2 .

It is a cyclic number.

It is not a de Polignac number, because 229681 - 2⁷ = 229553 is a prime.

It is a super-2 number, since 2×229681² = 105506723522, which contains 22 as substring.

It is a Chen prime.

229681 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (229601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114840 + 114841.

It is an arithmetic number, because the mean of its divisors is an integer number (114841).

2²²⁹⁶⁸¹ is an apocalyptic number.

It is an amenable number.

229681 is a deficient number, since it is larger than the sum of its proper divisors (1).

229681 is an equidigital number, since it uses as much as digits as its factorization.

229681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 28.

The square root of 229681 is about 479.2504564421. The cubic root of 229681 is about 61.2409177148.

The spelling of 229681 in words is "two hundred twenty-nine thousand, six hundred eighty-one".