55200009 has 4 divisors (see below), whose sum is σ = 73600016. Its totient is φ = 36800004.

The previous prime is 55200007. The next prime is 55200011. The reversal of 55200009 is 90000255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (55200007) and next prime (55200011).

It is not a de Polignac number, because 55200009 - 2¹ = 55200007 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55200007) 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, 9199999 + ... + 9200004.

It is an arithmetic number, because the mean of its divisors is an integer number (18400004).

Almost surely, 2^55200009 is an apocalyptic number.

It is an amenable number.

55200009 is a deficient number, since it is larger than the sum of its proper divisors (18400007).

55200009 is a wasteful number, since it uses less digits than its factorization.

55200009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18400006.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 55200009 is about 7429.6708540823. The cubic root of 55200009 is about 380.7556730859.

The spelling of 55200009 in words is "fifty-five million, two hundred thousand, nine".