55543219 has 2 divisors, whose sum is σ = 55543220. Its totient is φ = 55543218.

The previous prime is 55543217. The next prime is 55543231. The reversal of 55543219 is 91234555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55543219 - 2¹ = 55543217 is a prime.

It is a super-2 number, since 2×55543219² = 6170098353763922, which contains 22 as substring.

Together with 55543217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55543211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27771609 + 27771610.

It is an arithmetic number, because the mean of its divisors is an integer number (27771610).

Almost surely, 2^55543219 is an apocalyptic number.

55543219 is a deficient number, since it is larger than the sum of its proper divisors (1).

55543219 is an equidigital number, since it uses as much as digits as its factorization.

55543219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 34.

The square root of 55543219 is about 7452.7323177476. The cubic root of 55543219 is about 381.5431684319.

The spelling of 55543219 in words is "fifty-five million, five hundred forty-three thousand, two hundred nineteen".