55122139 has 4 divisors (see below), whose sum is σ = 55267960. Its totient is φ = 54976320.

The previous prime is 55122121. The next prime is 55122149. The reversal of 55122139 is 93122155.

55122139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55122139 - 2¹⁵ = 55089371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55122149) 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 3 ways as a sum of consecutive naturals, for example, 72342 + ... + 73099.

It is an arithmetic number, because the mean of its divisors is an integer number (13816990).

Almost surely, 2^55122139 is an apocalyptic number.

55122139 is a deficient number, since it is larger than the sum of its proper divisors (145821).

55122139 is a wasteful number, since it uses less digits than its factorization.

55122139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145820.

The product of its digits is 2700, while the sum is 28.

The square root of 55122139 is about 7424.4285301968. The cubic root of 55122139 is about 380.5765463202.

The spelling of 55122139 in words is "fifty-five million, one hundred twenty-two thousand, one hundred thirty-nine".