55321289 has 2 divisors, whose sum is σ = 55321290. Its totient is φ = 55321288.

The previous prime is 55321271. The next prime is 55321307. The reversal of 55321289 is 98212355.

It is a balanced prime because it is at equal distance from previous prime (55321271) and next prime (55321307).

It can be written as a sum of positive squares in only one way, i.e., 37002889 + 18318400 = 6083^2 + 4280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55321289 is a prime.

It is not a weakly prime, because it can be changed into another prime (55324289) 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, 27660644 + 27660645.

It is an arithmetic number, because the mean of its divisors is an integer number (27660645).

Almost surely, 2^55321289 is an apocalyptic number.

It is an amenable number.

55321289 is a deficient number, since it is larger than the sum of its proper divisors (1).

55321289 is an equidigital number, since it uses as much as digits as its factorization.

55321289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 35.

The square root of 55321289 is about 7437.8282448575. The cubic root of 55321289 is about 381.0343220137.

The spelling of 55321289 in words is "fifty-five million, three hundred twenty-one thousand, two hundred eighty-nine".