231243109 has 2 divisors, whose sum is σ = 231243110. Its totient is φ = 231243108.

The previous prime is 231243097. The next prime is 231243113. The reversal of 231243109 is 901342132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155500900 + 75742209 = 12470^2 + 8703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231243109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231243139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115621554 + 115621555.

It is an arithmetic number, because the mean of its divisors is an integer number (115621555).

Almost surely, 2^231243109 is an apocalyptic number.

It is an amenable number.

231243109 is a deficient number, since it is larger than the sum of its proper divisors (1).

231243109 is an equidigital number, since it uses as much as digits as its factorization.

231243109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 231243109 is about 15206.6797493733. The cubic root of 231243109 is about 613.7944161716.

The spelling of 231243109 in words is "two hundred thirty-one million, two hundred forty-three thousand, one hundred nine".