2550509 has 4 divisors (see below), whose sum is σ = 2746716. Its totient is φ = 2354304.

The previous prime is 2550497. The next prime is 2550551. The reversal of 2550509 is 9050552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 366025 + 2184484 = 605^2 + 1478^2 .

It is a cyclic number.

It is not a de Polignac number, because 2550509 - 2⁸ = 2550253 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 (2550209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98084 + ... + 98109.

It is an arithmetic number, because the mean of its divisors is an integer number (686679).

2^2550509 is an apocalyptic number.

It is an amenable number.

2550509 is a deficient number, since it is larger than the sum of its proper divisors (196207).

2550509 is a wasteful number, since it uses less digits than its factorization.

2550509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196206.

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

The square root of 2550509 is about 1597.0313083969. The cubic root of 2550509 is about 136.6288103226.

The spelling of 2550509 in words is "two million, five hundred fifty thousand, five hundred nine".