229772129 has 2 divisors, whose sum is σ = 229772130. Its totient is φ = 229772128.

The previous prime is 229772107. The next prime is 229772131. The reversal of 229772129 is 921277922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140375104 + 89397025 = 11848^2 + 9455^2 .

It is a cyclic number.

It is not a de Polignac number, because 229772129 - 2²⁰ = 228723553 is a prime.

It is a Sophie Germain prime.

Together with 229772131, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (229772189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114886064 + 114886065.

It is an arithmetic number, because the mean of its divisors is an integer number (114886065).

Almost surely, 2^229772129 is an apocalyptic number.

It is an amenable number.

229772129 is a deficient number, since it is larger than the sum of its proper divisors (1).

229772129 is an equidigital number, since it uses as much as digits as its factorization.

229772129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 229772129 is about 15158.2363420023. The cubic root of 229772129 is about 612.4901602751.

The spelling of 229772129 in words is "two hundred twenty-nine million, seven hundred seventy-two thousand, one hundred twenty-nine".