55057999 has 2 divisors, whose sum is σ = 55058000. Its totient is φ = 55057998.

The previous prime is 55057997. The next prime is 55058011. The reversal of 55057999 is 99975055.

It is a happy number.

55057999 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 55057999 - 2¹ = 55057997 is a prime.

Together with 55057997, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55057997) 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, 27528999 + 27529000.

It is an arithmetic number, because the mean of its divisors is an integer number (27529000).

Almost surely, 2^55057999 is an apocalyptic number.

55057999 is a deficient number, since it is larger than the sum of its proper divisors (1).

55057999 is an equidigital number, since it uses as much as digits as its factorization.

55057999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 637875, while the sum is 49.

The square root of 55057999 is about 7420.1077485438. The cubic root of 55057999 is about 380.4288763511.

The spelling of 55057999 in words is "fifty-five million, fifty-seven thousand, nine hundred ninety-nine".