55489999 has 2 divisors, whose sum is σ = 55490000. Its totient is φ = 55489998.

The previous prime is 55489997. The next prime is 55490027. The reversal of 55489999 is 99998455.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55489999 - 2¹ = 55489997 is a prime.

Together with 55489997, it forms a pair of twin primes.

55489999 is a modest number, since divided by 9999 gives 5548 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55489991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27744999 + 27745000.

It is an arithmetic number, because the mean of its divisors is an integer number (27745000).

Almost surely, 2^55489999 is an apocalyptic number.

55489999 is a deficient number, since it is larger than the sum of its proper divisors (1).

55489999 is an equidigital number, since it uses as much as digits as its factorization.

55489999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5248800, while the sum is 58.

The square root of 55489999 is about 7449.1609594638. The cubic root of 55489999 is about 381.4212680649.

The spelling of 55489999 in words is "fifty-five million, four hundred eighty-nine thousand, nine hundred ninety-nine".