55001909 has 2 divisors, whose sum is σ = 55001910.
Its totient is φ = 55001908.
The previous prime is 55001887. The next prime is 55001957. The reversal of 55001909 is 90910055.
55001909 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., 51523684 + 3478225 = 7178^2 + 1865^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-55001909 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (55006909) 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, 27500954 + 27500955.
It is an arithmetic number, because the mean of its divisors is an integer number (27500955).
Almost surely, 255001909 is an apocalyptic number.
It is an amenable number.
55001909 is a deficient number, since it is larger than the sum of its proper divisors (1).
55001909 is an equidigital number, since it uses as much as digits as its factorization.
55001909 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 2025, while the sum is 29.
The square root of 55001909 is about 7416.3271907326.
The cubic root of 55001909 is about 380.2996459260.
The spelling of 55001909 in words is "fifty-five million, one thousand, nine hundred nine".