55380121 has 2 divisors, whose sum is σ = 55380122. Its totient is φ = 55380120.

The previous prime is 55380107. The next prime is 55380151. The reversal of 55380121 is 12108355.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47114496 + 8265625 = 6864^2 + 2875^2 .

It is a cyclic number.

It is not a de Polignac number, because 55380121 - 2⁵ = 55380089 is a prime.

It is not a weakly prime, because it can be changed into another prime (55380151) 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 as a sum of consecutive naturals, namely, 27690060 + 27690061.

It is an arithmetic number, because the mean of its divisors is an integer number (27690061).

Almost surely, 2^55380121 is an apocalyptic number.

It is an amenable number.

55380121 is a deficient number, since it is larger than the sum of its proper divisors (1).

55380121 is an equidigital number, since it uses as much as digits as its factorization.

55380121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 55380121 is about 7441.7821118332. The cubic root of 55380121 is about 381.1693457981.

Adding to 55380121 its reverse (12108355), we get a palindrome (67488476).

The spelling of 55380121 in words is "fifty-five million, three hundred eighty thousand, one hundred twenty-one".