55199809 has 8 divisors (see below), whose sum is σ = 65120768. Its totient is φ = 45787680.

The previous prime is 55199803. The next prime is 55199813. The reversal of 55199809 is 90899155.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55199809 - 2³ = 55199801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55199801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126972 + ... + 127405.

It is an arithmetic number, because the mean of its divisors is an integer number (8140096).

Almost surely, 2^55199809 is an apocalyptic number.

It is an amenable number.

55199809 is a deficient number, since it is larger than the sum of its proper divisors (9920959).

55199809 is a wasteful number, since it uses less digits than its factorization.

55199809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254415.

The product of its (nonzero) digits is 145800, while the sum is 46.

The square root of 55199809 is about 7429.6573945237. The cubic root of 55199809 is about 380.7552132356.

The spelling of 55199809 in words is "fifty-five million, one hundred ninety-nine thousand, eight hundred nine".