121656755 has 8 divisors (see below), whose sum is σ = 159259824. Its totient is φ = 88477600.

The previous prime is 121656751. The next prime is 121656757. The reversal of 121656755 is 557656121.

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

It is not a de Polignac number, because 121656755 - 2² = 121656751 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121656751) 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, 1105916 + ... + 1106025.

It is an arithmetic number, because the mean of its divisors is an integer number (19907478).

Almost surely, 2^121656755 is an apocalyptic number.

121656755 is a deficient number, since it is larger than the sum of its proper divisors (37603069).

121656755 is a wasteful number, since it uses less digits than its factorization.

121656755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211957.

The product of its digits is 63000, while the sum is 38.

The square root of 121656755 is about 11029.8121017540. The cubic root of 121656755 is about 495.5019972814.

The spelling of 121656755 in words is "one hundred twenty-one million, six hundred fifty-six thousand, seven hundred fifty-five".