2180509 has 6 divisors (see below), whose sum is σ = 2254110. Its totient is φ = 2109240.

The previous prime is 2180501. The next prime is 2180527. The reversal of 2180509 is 9050812.

It can be written as a sum of positive squares in only one way, i.e., 1315609 + 864900 = 1147^2 + 930^2 .

It is not a de Polignac number, because 2180509 - 2³ = 2180501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 174 + ... + 2095.

It is an arithmetic number, because the mean of its divisors is an integer number (375685).

2^2180509 is an apocalyptic number.

It is an amenable number.

2180509 is a deficient number, since it is larger than the sum of its proper divisors (73601).

2180509 is an equidigital number, since it uses as much as digits as its factorization.

2180509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331 (or 2300 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2180509 is about 1476.6546651130. The cubic root of 2180509 is about 129.6739164851.

The spelling of 2180509 in words is "two million, one hundred eighty thousand, five hundred nine".