231631616 has 18 divisors (see below), whose sum is σ = 462358932. Its totient is φ = 115815680.

The previous prime is 231631601. The next prime is 231631619. The reversal of 231631616 is 616136132.

It is a happy number.

It is a super-3 number, since 3×231631616³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (231631619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452150 + ... + 452661.

Almost surely, 2^231631616 is an apocalyptic number.

It is an amenable number.

231631616 is a deficient number, since it is larger than the sum of its proper divisors (230727316).

231631616 is an frugal number, since it uses more digits than its factorization.

231631616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904827 (or 904813 counting only the distinct ones).

The product of its digits is 3888, while the sum is 29.

The square root of 231631616 is about 15219.4486102487. The cubic root of 231631616 is about 614.1379651562.

Adding to 231631616 its reverse (616136132), we get a palindrome (847767748).

The spelling of 231631616 in words is "two hundred thirty-one million, six hundred thirty-one thousand, six hundred sixteen".