55021289 has 2 divisors, whose sum is σ = 55021290. Its totient is φ = 55021288.

The previous prime is 55021279. The next prime is 55021297. The reversal of 55021289 is 98212055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46512400 + 8508889 = 6820^2 + 2917^2 .

It is a cyclic number.

It is not a de Polignac number, because 55021289 - 2⁴ = 55021273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55021259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27510644 + 27510645.

It is an arithmetic number, because the mean of its divisors is an integer number (27510645).

Almost surely, 2^55021289 is an apocalyptic number.

It is an amenable number.

55021289 is a deficient number, since it is larger than the sum of its proper divisors (1).

55021289 is an equidigital number, since it uses as much as digits as its factorization.

55021289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 55021289 is about 7417.6336523180. The cubic root of 55021289 is about 380.3443070527.

The spelling of 55021289 in words is "fifty-five million, twenty-one thousand, two hundred eighty-nine".