122209999999991 has 2 divisors, whose sum is σ = 122209999999992. Its totient is φ = 122209999999990.

The previous prime is 122209999999973. The next prime is 122210000000057. The reversal of 122209999999991 is 199999999902221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 122209999999991 - 2¹⁴ = 122209999983607 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 122209999999897 and 122209999999906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122209999999691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61104999999995 + 61104999999996.

It is an arithmetic number, because the mean of its divisors is an integer number (61104999999996).

Almost surely, 2^{122209999999991} is an apocalyptic number.

122209999999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

122209999999991 is an equidigital number, since it uses as much as digits as its factorization.

122209999999991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3099363912, while the sum is 89.

The spelling of 122209999999991 in words is "one hundred twenty-two trillion, two hundred nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-one".