225716309 has 16 divisors (see below), whose sum is σ = 287387520. Its totient is φ = 172428480.

The previous prime is 225716303. The next prime is 225716321. The reversal of 225716309 is 903617522.

It is a de Polignac number, because none of the positive numbers 2^k-225716309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225716303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40127 + ... + 45404.

It is an arithmetic number, because the mean of its divisors is an integer number (17961720).

Almost surely, 2^225716309 is an apocalyptic number.

225716309 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

225716309 is a deficient number, since it is larger than the sum of its proper divisors (61671211).

225716309 is a wasteful number, since it uses less digits than its factorization.

225716309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85580.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 225716309 is about 15023.8579932053. The cubic root of 225716309 is about 608.8649581984.

The spelling of 225716309 in words is "two hundred twenty-five million, seven hundred sixteen thousand, three hundred nine".