121110991 has 2 divisors, whose sum is σ = 121110992. Its totient is φ = 121110990.

The previous prime is 121110973. The next prime is 121111021. The reversal of 121110991 is 199011121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121110991 - 2¹³ = 121102799 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121110911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60555495 + 60555496.

It is an arithmetic number, because the mean of its divisors is an integer number (60555496).

Almost surely, 2^121110991 is an apocalyptic number.

121110991 is a deficient number, since it is larger than the sum of its proper divisors (1).

121110991 is an equidigital number, since it uses as much as digits as its factorization.

121110991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 25.

The square root of 121110991 is about 11005.0438890538. The cubic root of 121110991 is about 494.7599298409.

The spelling of 121110991 in words is "one hundred twenty-one million, one hundred ten thousand, nine hundred ninety-one".