55450321 has 2 divisors, whose sum is σ = 55450322. Its totient is φ = 55450320.

The previous prime is 55450319. The next prime is 55450333. The reversal of 55450321 is 12305455.

55450321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55353600 + 96721 = 7440^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 55450321 - 2¹ = 55450319 is a prime.

Together with 55450319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55450301) 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 as a sum of consecutive naturals, namely, 27725160 + 27725161.

It is an arithmetic number, because the mean of its divisors is an integer number (27725161).

Almost surely, 2^55450321 is an apocalyptic number.

It is an amenable number.

55450321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55450321 is an equidigital number, since it uses as much as digits as its factorization.

55450321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 55450321 is about 7446.4972302419. The cubic root of 55450321 is about 381.3303349120.

Adding to 55450321 its reverse (12305455), we get a palindrome (67755776).

The spelling of 55450321 in words is "fifty-five million, four hundred fifty thousand, three hundred twenty-one".