231236816 has 20 divisors (see below), whose sum is σ = 448480224. Its totient is φ = 115500000.

The previous prime is 231236813. The next prime is 231236833. The reversal of 231236816 is 618632132.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231236813) 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, 9941 + ... + 23691.

Almost surely, 2^231236816 is an apocalyptic number.

It is an amenable number.

231236816 is a deficient number, since it is larger than the sum of its proper divisors (217243408).

231236816 is a wasteful number, since it uses less digits than its factorization.

231236816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14810 (or 14804 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 231236816 is about 15206.4728323172. The cubic root of 231236816 is about 613.7888482316.

Adding to 231236816 its reverse (618632132), we get a palindrome (849868948).

The spelling of 231236816 in words is "two hundred thirty-one million, two hundred thirty-six thousand, eight hundred sixteen".