121956855 has 16 divisors (see below), whose sum is σ = 195804000. Its totient is φ = 64819328.

The previous prime is 121956851. The next prime is 121956871. The reversal of 121956855 is 558659121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121956855 - 2² = 121956851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121956851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9480 + ... + 18269.

It is an arithmetic number, because the mean of its divisors is an integer number (12237750).

Almost surely, 2^121956855 is an apocalyptic number.

121956855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121956855 is a deficient number, since it is larger than the sum of its proper divisors (73847145).

121956855 is a wasteful number, since it uses less digits than its factorization.

121956855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28050.

The product of its digits is 108000, while the sum is 42.

The square root of 121956855 is about 11043.4077620995. The cubic root of 121956855 is about 495.9090935873.

The spelling of 121956855 in words is "one hundred twenty-one million, nine hundred fifty-six thousand, eight hundred fifty-five".