55435909 has 2 divisors, whose sum is σ = 55435910. Its totient is φ = 55435908.

The previous prime is 55435903. The next prime is 55435921. The reversal of 55435909 is 90953455.

It is a happy number.

55435909 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., 43164900 + 12271009 = 6570^2 + 3503^2 .

It is a cyclic number.

It is not a de Polignac number, because 55435909 - 2²⁵ = 21881477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55435903) 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, 27717954 + 27717955.

It is an arithmetic number, because the mean of its divisors is an integer number (27717955).

Almost surely, 2^55435909 is an apocalyptic number.

It is an amenable number.

55435909 is a deficient number, since it is larger than the sum of its proper divisors (1).

55435909 is an equidigital number, since it uses as much as digits as its factorization.

55435909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 55435909 is about 7445.5294640475. The cubic root of 55435909 is about 381.2972950733.

It can be divided in two parts, 554 and 35909, that added together give a palindrome (36463).

The spelling of 55435909 in words is "fifty-five million, four hundred thirty-five thousand, nine hundred nine".