121555163 has 8 divisors (see below), whose sum is σ = 124340400. Its totient is φ = 118794208.

The previous prime is 121555157. The next prime is 121555169. The reversal of 121555163 is 361555121.

It is an interprime number because it is at equal distance from previous prime (121555157) and next prime (121555169).

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 121555163 - 2⁶ = 121555099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121555169) 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 7 ways as a sum of consecutive naturals, for example, 4253 + ... + 16161.

It is an arithmetic number, because the mean of its divisors is an integer number (15542550).

Almost surely, 2^121555163 is an apocalyptic number.

121555163 is a deficient number, since it is larger than the sum of its proper divisors (2785237).

121555163 is a wasteful number, since it uses less digits than its factorization.

121555163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12141.

The product of its digits is 4500, while the sum is 29.

The square root of 121555163 is about 11025.2058030678. The cubic root of 121555163 is about 495.3640324594.

The spelling of 121555163 in words is "one hundred twenty-one million, five hundred fifty-five thousand, one hundred sixty-three".