55220219 has 2 divisors, whose sum is σ = 55220220. Its totient is φ = 55220218.

The previous prime is 55220203. The next prime is 55220237. The reversal of 55220219 is 91202255.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55220219 - 2⁴ = 55220203 is a prime.

It is a super-2 number, since 2×55220219² = 6098545172815922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55220419) 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, 27610109 + 27610110.

It is an arithmetic number, because the mean of its divisors is an integer number (27610110).

Almost surely, 2^55220219 is an apocalyptic number.

55220219 is a deficient number, since it is larger than the sum of its proper divisors (1).

55220219 is an equidigital number, since it uses as much as digits as its factorization.

55220219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 55220219 is about 7431.0308167844. The cubic root of 55220219 is about 380.8021352355.

The spelling of 55220219 in words is "fifty-five million, two hundred twenty thousand, two hundred nineteen".