231199685149109 has 2 divisors, whose sum is σ = 231199685149110. Its totient is φ = 231199685149108.

The previous prime is 231199685149093. The next prime is 231199685149207. The reversal of 231199685149109 is 901941586991132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131500758194884 + 99698926954225 = 11467378^2 + 9984935^2 .

It is a cyclic number.

It is not a de Polignac number, because 231199685149109 - 2⁴ = 231199685149093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231199685142109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115599842574554 + 115599842574555.

It is an arithmetic number, because the mean of its divisors is an integer number (115599842574555).

Almost surely, 2^{231199685149109} is an apocalyptic number.

It is an amenable number.

231199685149109 is a deficient number, since it is larger than the sum of its proper divisors (1).

231199685149109 is an equidigital number, since it uses as much as digits as its factorization.

231199685149109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37791360, while the sum is 68.

The spelling of 231199685149109 in words is "two hundred thirty-one trillion, one hundred ninety-nine billion, six hundred eighty-five million, one hundred forty-nine thousand, one hundred nine".