231311244389 has 2 divisors, whose sum is σ = 231311244390. Its totient is φ = 231311244388.

The previous prime is 231311244377. The next prime is 231311244449. The reversal of 231311244389 is 983442113132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 177873062500 + 53438181889 = 421750^2 + 231167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231311244389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231311241389) 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, 115655622194 + 115655622195.

It is an arithmetic number, because the mean of its divisors is an integer number (115655622195).

Almost surely, 2^231311244389 is an apocalyptic number.

It is an amenable number.

231311244389 is a deficient number, since it is larger than the sum of its proper divisors (1).

231311244389 is an equidigital number, since it uses as much as digits as its factorization.

231311244389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 41.

The spelling of 231311244389 in words is "two hundred thirty-one billion, three hundred eleven million, two hundred forty-four thousand, three hundred eighty-nine".