231322229 has 2 divisors, whose sum is σ = 231322230. Its totient is φ = 231322228.

The previous prime is 231322211. The next prime is 231322243. The reversal of 231322229 is 922223132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 186459025 + 44863204 = 13655^2 + 6698^2 .

It is a cyclic number.

It is not a de Polignac number, because 231322229 - 2⁸ = 231321973 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231322198 and 231322207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231322249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115661114 + 115661115.

It is an arithmetic number, because the mean of its divisors is an integer number (115661115).

Almost surely, 2^231322229 is an apocalyptic number.

It is an amenable number.

231322229 is a deficient number, since it is larger than the sum of its proper divisors (1).

231322229 is an equidigital number, since it uses as much as digits as its factorization.

231322229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 231322229 is about 15209.2810152223. The cubic root of 231322229 is about 613.8644115930.

It can be divided in two parts, 2313 and 22229, that added together give a palindrome (24542).

The spelling of 231322229 in words is "two hundred thirty-one million, three hundred twenty-two thousand, two hundred twenty-nine".