55121255 has 32 divisors (see below), whose sum is σ = 78962688. Its totient is φ = 36144000.

The previous prime is 55121251. The next prime is 55121267. The reversal of 55121255 is 55212155.

55121255 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55121255 - 2² = 55121251 is a prime.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121251) 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 31 ways as a sum of consecutive naturals, for example, 109334 + ... + 109836.

It is an arithmetic number, because the mean of its divisors is an integer number (2467584).

Almost surely, 2^55121255 is an apocalyptic number.

55121255 is a deficient number, since it is larger than the sum of its proper divisors (23841433).

55121255 is a wasteful number, since it uses less digits than its factorization.

55121255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647.

The product of its digits is 2500, while the sum is 26.

The square root of 55121255 is about 7424.3689967566. The cubic root of 55121255 is about 380.5745118595.

The spelling of 55121255 in words is "fifty-five million, one hundred twenty-one thousand, two hundred fifty-five".