55555409 has 16 divisors (see below), whose sum is σ = 69320832. Its totient is φ = 43348608.

The previous prime is 55555399. The next prime is 55555429. The reversal of 55555409 is 90455555.

It is a cyclic number.

It is not a de Polignac number, because 55555409 - 2⁴ = 55555393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55555429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2462 + ... + 10824.

It is an arithmetic number, because the mean of its divisors is an integer number (4332552).

Almost surely, 2^55555409 is an apocalyptic number.

It is an amenable number.

55555409 is a deficient number, since it is larger than the sum of its proper divisors (13765423).

55555409 is a wasteful number, since it uses less digits than its factorization.

55555409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8456.

The product of its (nonzero) digits is 112500, while the sum is 38.

The square root of 55555409 is about 7453.5500937473. The cubic root of 55555409 is about 381.5710786557.

The spelling of 55555409 in words is "fifty-five million, five hundred fifty-five thousand, four hundred nine".