229878161 has 2 divisors, whose sum is σ = 229878162. Its totient is φ = 229878160.

The previous prime is 229878137. The next prime is 229878163. The reversal of 229878161 is 161878922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167547136 + 62331025 = 12944^2 + 7895^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-229878161 is a prime.

Together with 229878163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (229878163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114939080 + 114939081.

It is an arithmetic number, because the mean of its divisors is an integer number (114939081).

Almost surely, 2^229878161 is an apocalyptic number.

It is an amenable number.

229878161 is a deficient number, since it is larger than the sum of its proper divisors (1).

229878161 is an equidigital number, since it uses as much as digits as its factorization.

229878161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 44.

The square root of 229878161 is about 15161.7334431126. The cubic root of 229878161 is about 612.5843602255.

The spelling of 229878161 in words is "two hundred twenty-nine million, eight hundred seventy-eight thousand, one hundred sixty-one".