654716609 has 4 divisors (see below), whose sum is σ = 655690116. Its totient is φ = 653743104.

The previous prime is 654716539. The next prime is 654716617. The reversal of 654716609 is 906617456.

It is a happy number.

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 318801025 + 335915584 = 17855^2 + 18328^2 .

It is a cyclic number.

It is not a de Polignac number, because 654716609 - 2⁸ = 654716353 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 654716609.

It is not an unprimeable number, because it can be changed into a prime (654716509) 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 3 ways as a sum of consecutive naturals, for example, 485744 + ... + 487089.

It is an arithmetic number, because the mean of its divisors is an integer number (163922529).

Almost surely, 2^654716609 is an apocalyptic number.

It is an amenable number.

654716609 is a deficient number, since it is larger than the sum of its proper divisors (973507).

654716609 is an equidigital number, since it uses as much as digits as its factorization.

654716609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 973506.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 654716609 is about 25587.4306838338. The cubic root of 654716609 is about 868.3292942621.

The spelling of 654716609 in words is "six hundred fifty-four million, seven hundred sixteen thousand, six hundred nine".