55919219 has 2 divisors, whose sum is σ = 55919220. Its totient is φ = 55919218.

The previous prime is 55919209. The next prime is 55919287. The reversal of 55919219 is 91291955.

55919219 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 a de Polignac number, because none of the positive numbers 2^k-55919219 is a prime.

It is a super-2 number, since 2×55919219² = 6253918107139922, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (55919209) 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, 27959609 + 27959610.

It is an arithmetic number, because the mean of its divisors is an integer number (27959610).

Almost surely, 2^55919219 is an apocalyptic number.

55919219 is a deficient number, since it is larger than the sum of its proper divisors (1).

55919219 is an equidigital number, since it uses as much as digits as its factorization.

55919219 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36450, while the sum is 41.

The square root of 55919219 is about 7477.9154180828. The cubic root of 55919219 is about 382.4021855344.

The spelling of 55919219 in words is "fifty-five million, nine hundred nineteen thousand, two hundred nineteen".