2550409 has 3 divisors (see below), whose sum is σ = 2552007. Its totient is φ = 2548812.

The previous prime is 2550407. The next prime is 2550437. The reversal of 2550409 is 9040552.

The square root of 2550409 is 1597.

It is a perfect power (a square), and thus also a powerful number.

2550409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 511225 + 2039184 = 715^2 + 1428^2 .

It is not a de Polignac number, because 2550409 - 2¹ = 2550407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2550403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 799 + ... + 2395.

It is an arithmetic number, because the mean of its divisors is an integer number (850669).

2^2550409 is an apocalyptic number.

2550409 is the 1597-th square number.

2550409 is the 799-th centered octagonal number.

It is an amenable number.

2550409 is a deficient number, since it is larger than the sum of its proper divisors (1598).

2550409 is an frugal number, since it uses more digits than its factorization.

2550409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3194 (or 1597 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The cubic root of 2550409 is about 136.6270246581.

Multiplying 2550409 by its sum of digits (25), we get a square (63760225 = 7985²).

The spelling of 2550409 in words is "two million, five hundred fifty thousand, four hundred nine".