55506009 has 8 divisors (see below), whose sum is σ = 79700992. Its totient is φ = 34157520.

The previous prime is 55505993. The next prime is 55506023. The reversal of 55506009 is 90060555.

It is a happy number.

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

It is not a de Polignac number, because 55506009 - 2⁴ = 55505993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55506109) 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, 711577 + ... + 711654.

It is an arithmetic number, because the mean of its divisors is an integer number (9962624).

Almost surely, 2^55506009 is an apocalyptic number.

It is an amenable number.

55506009 is a deficient number, since it is larger than the sum of its proper divisors (24194983).

55506009 is a wasteful number, since it uses less digits than its factorization.

55506009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423247.

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 55506009 is about 7450.2354996336. The cubic root of 55506009 is about 381.4579471507.

The spelling of 55506009 in words is "fifty-five million, five hundred six thousand, nine".