55530121 has 4 divisors (see below), whose sum is σ = 56021652. Its totient is φ = 55038592.

The previous prime is 55530107. The next prime is 55530133. The reversal of 55530121 is 12103555.

55530121 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 can be written as a sum of positive squares in 2 ways, for example, as 31136400 + 24393721 = 5580^2 + 4939^2 .

It is a cyclic number.

It is not a de Polignac number, because 55530121 - 2⁵ = 55530089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55530092 and 55530101.

It is not an unprimeable number, because it can be changed into a prime (55530421) 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, 245596 + ... + 245821.

It is an arithmetic number, because the mean of its divisors is an integer number (14005413).

Almost surely, 2^55530121 is an apocalyptic number.

It is an amenable number.

55530121 is a deficient number, since it is larger than the sum of its proper divisors (491531).

55530121 is a wasteful number, since it uses less digits than its factorization.

55530121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491530.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 55530121 is about 7451.8535278144. The cubic root of 55530121 is about 381.5131746998.

Adding to 55530121 its reverse (12103555), we get a palindrome (67633676).

The spelling of 55530121 in words is "fifty-five million, five hundred thirty thousand, one hundred twenty-one".