231223216 has 40 divisors (see below), whose sum is σ = 512744960. Its totient is φ = 98950464.

The previous prime is 231223211. The next prime is 231223219. The reversal of 231223216 is 612322132.

231223216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (231223211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115375 + ... + 117361.

It is an arithmetic number, because the mean of its divisors is an integer number (12818624).

Almost surely, 2^231223216 is an apocalyptic number.

It is an amenable number.

231223216 is an abundant number, since it is smaller than the sum of its proper divisors (281521744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231223216 is a wasteful number, since it uses less digits than its factorization.

231223216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3041 (or 3035 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 231223216 is about 15206.0256477490. The cubic root of 231223216 is about 613.7768148363.

Adding to 231223216 its reverse (612322132), we get a palindrome (843545348).

The spelling of 231223216 in words is "two hundred thirty-one million, two hundred twenty-three thousand, two hundred sixteen".