229855981 has 2 divisors, whose sum is σ = 229855982. Its totient is φ = 229855980.

The previous prime is 229855973. The next prime is 229855987. The reversal of 229855981 is 189558922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206381956 + 23474025 = 14366^2 + 4845^2 .

It is a cyclic number.

It is not a de Polignac number, because 229855981 - 2³ = 229855973 is a prime.

It is a super-2 number, since 2×229855981² = 105667544002944722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229855987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114927990 + 114927991.

It is an arithmetic number, because the mean of its divisors is an integer number (114927991).

Almost surely, 2^229855981 is an apocalyptic number.

It is an amenable number.

229855981 is a deficient number, since it is larger than the sum of its proper divisors (1).

229855981 is an equidigital number, since it uses as much as digits as its factorization.

229855981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 49.

The square root of 229855981 is about 15161.0019787612. The cubic root of 229855981 is about 612.5646576752.

The spelling of 229855981 in words is "two hundred twenty-nine million, eight hundred fifty-five thousand, nine hundred eighty-one".