55139553 has 36 divisors (see below), whose sum is σ = 93677220. Its totient is φ = 31159296.

The previous prime is 55139549. The next prime is 55139597. The reversal of 55139553 is 35593155.

55139553 is a `hidden beast` number, since 5 + 513 + 95 + 53 = 666.

55139553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 35319249 + 19820304 = 5943^2 + 4452^2 .

It is not a de Polignac number, because 55139553 - 2² = 55139549 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55139543) 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 35 ways as a sum of consecutive naturals, for example, 42133 + ... + 43421.

It is an arithmetic number, because the mean of its divisors is an integer number (2602145).

Almost surely, 2^55139553 is an apocalyptic number.

It is an amenable number.

55139553 is a deficient number, since it is larger than the sum of its proper divisors (38537667).

55139553 is a wasteful number, since it uses less digits than its factorization.

55139553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1406 (or 1396 counting only the distinct ones).

The product of its digits is 50625, while the sum is 36.

The square root of 55139553 is about 7425.6011877827. The cubic root of 55139553 is about 380.6166189197.

It can be divided in two parts, 551 and 39553, that added together give a palindrome (40104).

The spelling of 55139553 in words is "fifty-five million, one hundred thirty-nine thousand, five hundred fifty-three".