231229 has 4 divisors (see below), whose sum is σ = 238720. Its totient is φ = 223740.

The previous prime is 231223. The next prime is 231241. The reversal of 231229 is 922132.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231229 - 2⁵ = 231197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3699 + ... + 3760.

It is an arithmetic number, because the mean of its divisors is an integer number (59680).

2²³¹²²⁹ is an apocalyptic number.

It is an amenable number.

231229 is a deficient number, since it is larger than the sum of its proper divisors (7491).

231229 is an equidigital number, since it uses as much as digits as its factorization.

231229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7490.

The product of its digits is 216, while the sum is 19.

The square root of 231229 is about 480.8627662858. The cubic root of 231229 is about 61.3781932626.

The spelling of 231229 in words is "two hundred thirty-one thousand, two hundred twenty-nine".