55056409 has 4 divisors (see below), whose sum is σ = 55297060. Its totient is φ = 54815760.

The previous prime is 55056401. The next prime is 55056427. The reversal of 55056409 is 90465055.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90465055 = 5 ⋅18093011.

It can be written as a sum of positive squares in 2 ways, for example, as 51265600 + 3790809 = 7160^2 + 1947^2 .

It is a cyclic number.

It is not a de Polignac number, because 55056409 - 2³ = 55056401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55056401) 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, 119982 + ... + 120439.

It is an arithmetic number, because the mean of its divisors is an integer number (13824265).

Almost surely, 2^55056409 is an apocalyptic number.

It is an amenable number.

55056409 is a deficient number, since it is larger than the sum of its proper divisors (240651).

55056409 is a wasteful number, since it uses less digits than its factorization.

55056409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240650.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 55056409 is about 7420.0006064690. Note that the first 3 decimals coincide. The cubic root of 55056409 is about 380.4252142266.

The spelling of 55056409 in words is "fifty-five million, fifty-six thousand, four hundred nine".