231133109 has 2 divisors, whose sum is σ = 231133110. Its totient is φ = 231133108.

The previous prime is 231133093. The next prime is 231133153. The reversal of 231133109 is 901331132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204404209 + 26728900 = 14297^2 + 5170^2 .

It is a cyclic number.

It is not a de Polignac number, because 231133109 - 2⁴ = 231133093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231133009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115566554 + 115566555.

It is an arithmetic number, because the mean of its divisors is an integer number (115566555).

Almost surely, 2^231133109 is an apocalyptic number.

It is an amenable number.

231133109 is a deficient number, since it is larger than the sum of its proper divisors (1).

231133109 is an equidigital number, since it uses as much as digits as its factorization.

231133109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 231133109 is about 15203.0624875385. The cubic root of 231133109 is about 613.6970754772.

The spelling of 231133109 in words is "two hundred thirty-one million, one hundred thirty-three thousand, one hundred nine".