121553771191 has 2 divisors, whose sum is σ = 121553771192. Its totient is φ = 121553771190.

The previous prime is 121553771167. The next prime is 121553771239. The reversal of 121553771191 is 191177355121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121553771191 - 2³¹ = 119406287543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121553771111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60776885595 + 60776885596.

It is an arithmetic number, because the mean of its divisors is an integer number (60776885596).

Almost surely, 2^121553771191 is an apocalyptic number.

121553771191 is a deficient number, since it is larger than the sum of its proper divisors (1).

121553771191 is an equidigital number, since it uses as much as digits as its factorization.

121553771191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 66150, while the sum is 43.

The spelling of 121553771191 in words is "one hundred twenty-one billion, five hundred fifty-three million, seven hundred seventy-one thousand, one hundred ninety-one".