229718861 has 2 divisors, whose sum is σ = 229718862. Its totient is φ = 229718860.

The previous prime is 229718843. The next prime is 229718887. The reversal of 229718861 is 168817922.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201469636 + 28249225 = 14194^2 + 5315^2 .

It is a cyclic number.

It is not a de Polignac number, because 229718861 - 2¹⁰ = 229717837 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (229718891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 114859430 + 114859431.

It is an arithmetic number, because the mean of its divisors is an integer number (114859431).

Almost surely, 2^229718861 is an apocalyptic number.

It is an amenable number.

229718861 is a deficient number, since it is larger than the sum of its proper divisors (1).

229718861 is an equidigital number, since it uses as much as digits as its factorization.

229718861 is an evil number, because the sum of its binary digits is even.

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

The square root of 229718861 is about 15156.4791755869. The cubic root of 229718861 is about 612.4428254836.

The spelling of 229718861 in words is "two hundred twenty-nine million, seven hundred eighteen thousand, eight hundred sixty-one".