55121108 has 12 divisors (see below), whose sum is σ = 110242272. Its totient is φ = 23623320.

The previous prime is 55121107. The next prime is 55121149. The reversal of 55121108 is 80112155.

55121108 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55121107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 984278 + ... + 984333.

It is an arithmetic number, because the mean of its divisors is an integer number (9186856).

Almost surely, 2^55121108 is an apocalyptic number.

It is an amenable number.

55121108 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55121108 is a wasteful number, since it uses less digits than its factorization.

55121108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968622 (or 1968620 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 55121108 is about 7424.3590969187. The cubic root of 55121108 is about 380.5741735478.

The spelling of 55121108 in words is "fifty-five million, one hundred twenty-one thousand, one hundred eight".