55005509 has 8 divisors (see below), whose sum is σ = 59824632. Its totient is φ = 50270400.

The previous prime is 55005481. The next prime is 55005521. The reversal of 55005509 is 90550055.

It can be written as a sum of positive squares in 4 ways, for example, as 23980609 + 31024900 = 4897^2 + 5570^2 .

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 55005509 - 2²⁰ = 53956933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55005109) 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, 19634 + ... + 22259.

It is an arithmetic number, because the mean of its divisors is an integer number (7478079).

Almost surely, 2^55005509 is an apocalyptic number.

It is an amenable number.

55005509 is a deficient number, since it is larger than the sum of its proper divisors (4819123).

55005509 is a wasteful number, since it uses less digits than its factorization.

55005509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42007.

The product of its (nonzero) digits is 5625, while the sum is 29.

The square root of 55005509 is about 7416.5698944997. The cubic root of 55005509 is about 380.3079429038.

The spelling of 55005509 in words is "fifty-five million, five thousand, five hundred nine".