2055509 has 2 divisors, whose sum is σ = 2055510. Its totient is φ = 2055508.

The previous prime is 2055503. The next prime is 2055511. The reversal of 2055509 is 9055502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2044900 + 10609 = 1430^2 + 103^2 .

It is a cyclic number.

It is not a de Polignac number, because 2055509 - 2⁸ = 2055253 is a prime.

Together with 2055511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2055503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1027754 + 1027755.

It is an arithmetic number, because the mean of its divisors is an integer number (1027755).

2^2055509 is an apocalyptic number.

It is an amenable number.

2055509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2055509 is an equidigital number, since it uses as much as digits as its factorization.

2055509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 2055509 is about 1433.7046418283. The cubic root of 2055509 is about 127.1471005131.

The spelling of 2055509 in words is "two million, fifty-five thousand, five hundred nine".