231771229 has 2 divisors, whose sum is σ = 231771230. Its totient is φ = 231771228.

The previous prime is 231771209. The next prime is 231771271. The reversal of 231771229 is 922177132.

231771229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160706329 + 71064900 = 12677^2 + 8430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231771229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231771194 and 231771203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231771209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115885614 + 115885615.

It is an arithmetic number, because the mean of its divisors is an integer number (115885615).

Almost surely, 2^231771229 is an apocalyptic number.

It is an amenable number.

231771229 is a deficient number, since it is larger than the sum of its proper divisors (1).

231771229 is an equidigital number, since it uses as much as digits as its factorization.

231771229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 231771229 is about 15224.0345835130. The cubic root of 231771229 is about 614.2613283142.

The spelling of 231771229 in words is "two hundred thirty-one million, seven hundred seventy-one thousand, two hundred twenty-nine".