231205223 has 16 divisors (see below), whose sum is σ = 251682816. Its totient is φ = 211749120.

The previous prime is 231205207. The next prime is 231205259. The reversal of 231205223 is 322502132.

It is a cyclic number.

It is not a de Polignac number, because 231205223 - 2⁴ = 231205207 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231205195 and 231205204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231205283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67490 + ... + 70832.

It is an arithmetic number, because the mean of its divisors is an integer number (15730176).

Almost surely, 2^231205223 is an apocalyptic number.

231205223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

231205223 is a deficient number, since it is larger than the sum of its proper divisors (20477593).

231205223 is a wasteful number, since it uses less digits than its factorization.

231205223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3494.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 231205223 is about 15205.4339957793. The cubic root of 231205223 is about 613.7608937524.

Adding to 231205223 its reverse (322502132), we get a palindrome (553707355).

The spelling of 231205223 in words is "two hundred thirty-one million, two hundred five thousand, two hundred twenty-three".