55907809 has 2 divisors, whose sum is σ = 55907810. Its totient is φ = 55907808.

The previous prime is 55907791. The next prime is 55907833. The reversal of 55907809 is 90870955.

55907809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36300625 + 19607184 = 6025^2 + 4428^2 .

It is a cyclic number.

It is not a de Polignac number, because 55907809 - 2¹¹ = 55905761 is a prime.

It is not a weakly prime, because it can be changed into another prime (55907879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27953904 + 27953905.

It is an arithmetic number, because the mean of its divisors is an integer number (27953905).

Almost surely, 2^55907809 is an apocalyptic number.

It is an amenable number.

55907809 is a deficient number, since it is larger than the sum of its proper divisors (1).

55907809 is an equidigital number, since it uses as much as digits as its factorization.

55907809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113400, while the sum is 43.

The square root of 55907809 is about 7477.1524660127. The cubic root of 55907809 is about 382.3761747650.

The spelling of 55907809 in words is "fifty-five million, nine hundred seven thousand, eight hundred nine".