55573321 has 2 divisors, whose sum is σ = 55573322. Its totient is φ = 55573320.

The previous prime is 55573319. The next prime is 55573361. The reversal of 55573321 is 12337555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53582400 + 1990921 = 7320^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 55573321 - 2¹ = 55573319 is a prime.

Together with 55573319, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55573361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27786660 + 27786661.

It is an arithmetic number, because the mean of its divisors is an integer number (27786661).

Almost surely, 2^55573321 is an apocalyptic number.

It is an amenable number.

55573321 is a deficient number, since it is larger than the sum of its proper divisors (1).

55573321 is an equidigital number, since it uses as much as digits as its factorization.

55573321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15750, while the sum is 31.

The square root of 55573321 is about 7454.7515719841. The cubic root of 55573321 is about 381.6120825644.

The spelling of 55573321 in words is "fifty-five million, five hundred seventy-three thousand, three hundred twenty-one".