231321116 has 18 divisors (see below), whose sum is σ = 438347952. Its totient is φ = 106763280.

The previous prime is 231321113. The next prime is 231321121. The reversal of 231321116 is 611123132.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 170420 + ... + 171771.

It is an arithmetic number, because the mean of its divisors is an integer number (24352664).

Almost surely, 2^231321116 is an apocalyptic number.

231321116 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

231321116 is a deficient number, since it is larger than the sum of its proper divisors (207026836).

231321116 is a wasteful number, since it uses less digits than its factorization.

231321116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342221 (or 342206 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

The square root of 231321116 is about 15209.2444256774. The cubic root of 231321116 is about 613.8634270613.

Adding to 231321116 its reverse (611123132), we get a palindrome (842444248).

The spelling of 231321116 in words is "two hundred thirty-one million, three hundred twenty-one thousand, one hundred sixteen".