55303121 has 4 divisors (see below), whose sum is σ = 56060772. Its totient is φ = 54545472.

The previous prime is 55303111. The next prime is 55303133. The reversal of 55303121 is 12130355.

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 30691600 + 24611521 = 5540^2 + 4961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55303121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55303093 and 55303102.

It is not an unprimeable number, because it can be changed into a prime (55303111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378716 + ... + 378861.

It is an arithmetic number, because the mean of its divisors is an integer number (14015193).

Almost surely, 2^55303121 is an apocalyptic number.

It is an amenable number.

55303121 is a deficient number, since it is larger than the sum of its proper divisors (757651).

55303121 is an equidigital number, since it uses as much as digits as its factorization.

55303121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757650.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 55303121 is about 7436.6068203180. The cubic root of 55303121 is about 380.9926057676.

Adding to 55303121 its reverse (12130355), we get a palindrome (67433476).

The spelling of 55303121 in words is "fifty-five million, three hundred three thousand, one hundred twenty-one".