654386609 has 4 divisors (see below), whose sum is σ = 670347300. Its totient is φ = 638425920.

The previous prime is 654386597. The next prime is 654386611. The reversal of 654386609 is 906683456.

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 80640400 + 573746209 = 8980^2 + 23953^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654386609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (654386659) 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, 7980284 + ... + 7980365.

It is an arithmetic number, because the mean of its divisors is an integer number (167586825).

Almost surely, 2^654386609 is an apocalyptic number.

It is an amenable number.

654386609 is a deficient number, since it is larger than the sum of its proper divisors (15960691).

654386609 is a wasteful number, since it uses less digits than its factorization.

654386609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15960690.

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 654386609 is about 25580.9813924329. The cubic root of 654386609 is about 868.1833803302.

The spelling of 654386609 in words is "six hundred fifty-four million, three hundred eighty-six thousand, six hundred nine".