55549909 has 2 divisors, whose sum is σ = 55549910. Its totient is φ = 55549908.

The previous prime is 55549889. The next prime is 55549933. The reversal of 55549909 is 90994555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53802225 + 1747684 = 7335^2 + 1322^2 .

It is a cyclic number.

It is not a de Polignac number, because 55549909 - 2¹¹ = 55547861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55549979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27774954 + 27774955.

It is an arithmetic number, because the mean of its divisors is an integer number (27774955).

Almost surely, 2^55549909 is an apocalyptic number.

It is an amenable number.

55549909 is a deficient number, since it is larger than the sum of its proper divisors (1).

55549909 is an equidigital number, since it uses as much as digits as its factorization.

55549909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 364500, while the sum is 46.

The square root of 55549909 is about 7453.1811329123. The cubic root of 55549909 is about 381.5584863613.

The spelling of 55549909 in words is "fifty-five million, five hundred forty-nine thousand, nine hundred nine".