121775857 has 8 divisors (see below), whose sum is σ = 140849856. Its totient is φ = 103121232.

The previous prime is 121775851. The next prime is 121775873. The reversal of 121775857 is 758577121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121775857 - 2⁷ = 121775729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121775851) 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 in 7 ways as a sum of consecutive naturals, for example, 104218 + ... + 105379.

It is an arithmetic number, because the mean of its divisors is an integer number (17606232).

Almost surely, 2^121775857 is an apocalyptic number.

It is an amenable number.

121775857 is a deficient number, since it is larger than the sum of its proper divisors (19073999).

121775857 is an equidigital number, since it uses as much as digits as its factorization.

121775857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209687.

The product of its digits is 137200, while the sum is 43.

The square root of 121775857 is about 11035.2098756662. The cubic root of 121775857 is about 495.6636434108.

The spelling of 121775857 in words is "one hundred twenty-one million, seven hundred seventy-five thousand, eight hundred fifty-seven".