121055999 has 2 divisors, whose sum is σ = 121056000. Its totient is φ = 121055998.

The previous prime is 121055993. The next prime is 121056029. The reversal of 121055999 is 999550121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121055999 - 2⁴ = 121055983 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121055993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60527999 + 60528000.

It is an arithmetic number, because the mean of its divisors is an integer number (60528000).

Almost surely, 2^121055999 is an apocalyptic number.

121055999 is a deficient number, since it is larger than the sum of its proper divisors (1).

121055999 is an equidigital number, since it uses as much as digits as its factorization.

121055999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36450, while the sum is 41.

The square root of 121055999 is about 11002.5451146542. The cubic root of 121055999 is about 494.6850344718.

The spelling of 121055999 in words is "one hundred twenty-one million, fifty-five thousand, nine hundred ninety-nine".