231217216 has 28 divisors (see below), whose sum is σ = 462450688. Its totient is φ = 114694272.

The previous prime is 231217211. The next prime is 231217247. The reversal of 231217216 is 612712132.

It is a happy number.

231217216 is an admirable number.

It is a super-2 number, since 2×231217216² = 106922801949581312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231217211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6096 + ... + 22351.

It is an arithmetic number, because the mean of its divisors is an integer number (16516096).

Almost surely, 2^231217216 is an apocalyptic number.

It is an amenable number.

231217216 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

231217216 is a wasteful number, since it uses less digits than its factorization.

231217216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28586 (or 28576 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 231217216 is about 15205.8283562587. The cubic root of 231217216 is about 613.7715058355.

Adding to 231217216 its reverse (612712132), we get a palindrome (843929348).

The spelling of 231217216 in words is "two hundred thirty-one million, two hundred seventeen thousand, two hundred sixteen".