55530019 has 2 divisors, whose sum is σ = 55530020. Its totient is φ = 55530018.

The previous prime is 55530017. The next prime is 55530029. The reversal of 55530019 is 91003555.

55530019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55530019 - 2¹ = 55530017 is a prime.

It is a super-2 number, since 2×55530019² = 6167166020280722, which contains 22 as substring.

Together with 55530017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55530011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27765009 + 27765010.

It is an arithmetic number, because the mean of its divisors is an integer number (27765010).

Almost surely, 2^55530019 is an apocalyptic number.

55530019 is a deficient number, since it is larger than the sum of its proper divisors (1).

55530019 is an equidigital number, since it uses as much as digits as its factorization.

55530019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3375, while the sum is 28.

The square root of 55530019 is about 7451.8466838764. The cubic root of 55530019 is about 381.5129411066.

Subtracting from 55530019 its sum of digits (28), we obtain a triangular number (55529991 = T₁₀₅₃₈).

The spelling of 55530019 in words is "fifty-five million, five hundred thirty thousand, nineteen".