55606321 has 2 divisors, whose sum is σ = 55606322. Its totient is φ = 55606320.

The previous prime is 55606297. The next prime is 55606333. The reversal of 55606321 is 12360655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51279921 + 4326400 = 7161^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 55606321 - 2⁷ = 55606193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55606321.

It is not a weakly prime, because it can be changed into another prime (55606351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27803160 + 27803161.

It is an arithmetic number, because the mean of its divisors is an integer number (27803161).

Almost surely, 2^55606321 is an apocalyptic number.

It is an amenable number.

55606321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55606321 is an equidigital number, since it uses as much as digits as its factorization.

55606321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 55606321 is about 7456.9645969389. The cubic root of 55606321 is about 381.6876026560.

Adding to 55606321 its reverse (12360655), we get a palindrome (67966976).

It can be divided in two parts, 5560 and 6321, that added together give a square (11881 = 109²).

The spelling of 55606321 in words is "fifty-five million, six hundred six thousand, three hundred twenty-one".