55199999 has 4 divisors (see below), whose sum is σ = 55395336. Its totient is φ = 55004664.

The previous prime is 55199993. The next prime is 55200007. The reversal of 55199999 is 99999155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99999155 = 5 ⋅19999831.

It is a cyclic number.

It is not a de Polignac number, because 55199999 - 2⁴ = 55199983 is a prime.

It is a Duffinian number.

55199999 is a modest number, since divided by 9999 gives 5519 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55199993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97244 + ... + 97809.

It is an arithmetic number, because the mean of its divisors is an integer number (13848834).

Almost surely, 2^55199999 is an apocalyptic number.

55199999 is a deficient number, since it is larger than the sum of its proper divisors (195337).

55199999 is a wasteful number, since it uses less digits than its factorization.

55199999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195336.

The product of its digits is 1476225, while the sum is 56.

The square root of 55199999 is about 7429.6701811049. The cubic root of 55199999 is about 380.7556500934.

The spelling of 55199999 in words is "fifty-five million, one hundred ninety-nine thousand, nine hundred ninety-nine".