123318786091 has 2 divisors, whose sum is σ = 123318786092. Its totient is φ = 123318786090.

The previous prime is 123318786089. The next prime is 123318786127. The reversal of 123318786091 is 190687813321.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (190687813321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123318786091 - 2¹ = 123318786089 is a prime.

Together with 123318786089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123318786011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61659393045 + 61659393046.

It is an arithmetic number, because the mean of its divisors is an integer number (61659393046).

Almost surely, 2^123318786091 is an apocalyptic number.

123318786091 is a deficient number, since it is larger than the sum of its proper divisors (1).

123318786091 is an equidigital number, since it uses as much as digits as its factorization.

123318786091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 123318786091 in words is "one hundred twenty-three billion, three hundred eighteen million, seven hundred eighty-six thousand, ninety-one".