231550441331309 has 2 divisors, whose sum is σ = 231550441331310. Its totient is φ = 231550441331308.

The previous prime is 231550441331281. The next prime is 231550441331311. The reversal of 231550441331309 is 903133144055132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185098337857225 + 46452103474084 = 13605085^2 + 6815578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231550441331309 is a prime.

It is a Sophie Germain prime.

Together with 231550441331311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231550441331309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231550441331329) 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, 115775220665654 + 115775220665655.

It is an arithmetic number, because the mean of its divisors is an integer number (115775220665655).

Almost surely, 2^{231550441331309} is an apocalyptic number.

It is an amenable number.

231550441331309 is a deficient number, since it is larger than the sum of its proper divisors (1).

231550441331309 is an equidigital number, since it uses as much as digits as its factorization.

231550441331309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 583200, while the sum is 44.

The spelling of 231550441331309 in words is "two hundred thirty-one trillion, five hundred fifty billion, four hundred forty-one million, three hundred thirty-one thousand, three hundred nine".