55856009 has 4 divisors (see below), whose sum is σ = 60933840. Its totient is φ = 50778180.

The previous prime is 55855979. The next prime is 55856027. The reversal of 55856009 is 90065855.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55856009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55856039) 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, 2538899 + ... + 2538920.

It is an arithmetic number, because the mean of its divisors is an integer number (15233460).

Almost surely, 2^55856009 is an apocalyptic number.

It is an amenable number.

55856009 is a deficient number, since it is larger than the sum of its proper divisors (5077831).

55856009 is a wasteful number, since it uses less digits than its factorization.

55856009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077830.

The product of its (nonzero) digits is 54000, while the sum is 38.

The square root of 55856009 is about 7473.6877777975. The cubic root of 55856009 is about 382.2580445395.

The spelling of 55856009 in words is "fifty-five million, eight hundred fifty-six thousand, nine".