231320222389 has 2 divisors, whose sum is σ = 231320222390. Its totient is φ = 231320222388.

The previous prime is 231320222387. The next prime is 231320222407. The reversal of 231320222389 is 983222023132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 189936457489 + 41383764900 = 435817^2 + 203430^2 .

It is a cyclic number.

It is not a de Polignac number, because 231320222389 - 2¹ = 231320222387 is a prime.

Together with 231320222387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231320222387) 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, 115660111194 + 115660111195.

It is an arithmetic number, because the mean of its divisors is an integer number (115660111195).

Almost surely, 2^231320222389 is an apocalyptic number.

It is an amenable number.

231320222389 is a deficient number, since it is larger than the sum of its proper divisors (1).

231320222389 is an equidigital number, since it uses as much as digits as its factorization.

231320222389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 37.

The spelling of 231320222389 in words is "two hundred thirty-one billion, three hundred twenty million, two hundred twenty-two thousand, three hundred eighty-nine".