55380019 has 2 divisors, whose sum is σ = 55380020. Its totient is φ = 55380018.

The previous prime is 55380011. The next prime is 55380047. The reversal of 55380019 is 91008355.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55380019 - 2³ = 55380011 is a prime.

It is a super-2 number, since 2×55380019² = 6133893008880722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55380011) 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, 27690009 + 27690010.

It is an arithmetic number, because the mean of its divisors is an integer number (27690010).

Almost surely, 2^55380019 is an apocalyptic number.

55380019 is a deficient number, since it is larger than the sum of its proper divisors (1).

55380019 is an equidigital number, since it uses as much as digits as its factorization.

55380019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 55380019 is about 7441.7752586328. The cubic root of 55380019 is about 381.1691117833.

The spelling of 55380019 in words is "fifty-five million, three hundred eighty thousand, nineteen".