121558255 has 32 divisors (see below), whose sum is σ = 180238464. Its totient is φ = 76640256.

The previous prime is 121558237. The next prime is 121558267. The reversal of 121558255 is 552855121.

It is not a de Polignac number, because 121558255 - 2⁷ = 121558127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121558255.

It is a congruent number.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 196707 + ... + 197323.

It is an arithmetic number, because the mean of its divisors is an integer number (5632452).

Almost surely, 2^121558255 is an apocalyptic number.

121558255 is a deficient number, since it is larger than the sum of its proper divisors (58680209).

121558255 is a wasteful number, since it uses less digits than its factorization.

121558255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075.

The product of its digits is 20000, while the sum is 34.

The square root of 121558255 is about 11025.3460263159. The cubic root of 121558255 is about 495.3682326172.

The spelling of 121558255 in words is "one hundred twenty-one million, five hundred fifty-eight thousand, two hundred fifty-five".