231310109 has 12 divisors (see below), whose sum is σ = 249764148. Its totient is φ = 214118400.

The previous prime is 231310091. The next prime is 231310117. The reversal of 231310109 is 901013132.

231310109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 9746884 + 221563225 = 3122^2 + 14885^2 .

It is a de Polignac number, because none of the positive numbers 2^k-231310109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231310159) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11069 + ... + 24189.

It is an arithmetic number, because the mean of its divisors is an integer number (20813679).

Almost surely, 2^231310109 is an apocalyptic number.

It is an amenable number.

231310109 is a deficient number, since it is larger than the sum of its proper divisors (18454039).

231310109 is a wasteful number, since it uses less digits than its factorization.

231310109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13216 (or 13199 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 231310109 is about 15208.8825690778. The cubic root of 231310109 is about 613.8536903772.

The spelling of 231310109 in words is "two hundred thirty-one million, three hundred ten thousand, one hundred nine".