225782509 has 4 divisors (see below), whose sum is σ = 225814716. Its totient is φ = 225750304.

The previous prime is 225782507. The next prime is 225782569. The reversal of 225782509 is 905287522.

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 2 ways, for example, as 132756484 + 93026025 = 11522^2 + 9645^2 .

It is a cyclic number.

It is not a de Polignac number, because 225782509 - 2¹ = 225782507 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 (225782507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634 + ... + 21259.

It is an arithmetic number, because the mean of its divisors is an integer number (56453679).

Almost surely, 2^225782509 is an apocalyptic number.

It is an amenable number.

225782509 is a deficient number, since it is larger than the sum of its proper divisors (32207).

225782509 is a wasteful number, since it uses less digits than its factorization.

225782509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32206.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 225782509 is about 15026.0609941528. The cubic root of 225782509 is about 608.9244767456.

The spelling of 225782509 in words is "two hundred twenty-five million, seven hundred eighty-two thousand, five hundred nine".