55099999 has 4 divisors (see below), whose sum is σ = 55122120. Its totient is φ = 55077880.

The previous prime is 55099997. The next prime is 55100011. The reversal of 55099999 is 99999055.

55099999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55099999 - 2¹ = 55099997 is a prime.

It is a Duffinian number.

55099999 is a modest number, since divided by 9999 gives 5509 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55099997) 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 in 3 ways as a sum of consecutive naturals, for example, 6769 + ... + 12490.

It is an arithmetic number, because the mean of its divisors is an integer number (13780530).

Almost surely, 2^55099999 is an apocalyptic number.

55099999 is a deficient number, since it is larger than the sum of its proper divisors (22121).

55099999 is a wasteful number, since it uses less digits than its factorization.

55099999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22120.

The product of its (nonzero) digits is 1476225, while the sum is 55.

The square root of 55099999 is about 7422.9373565995. The cubic root of 55099999 is about 380.5255861963.

The spelling of 55099999 in words is "fifty-five million, ninety-nine thousand, nine hundred ninety-nine".