655120609 has 16 divisors (see below), whose sum is σ = 787558464. Its totient is φ = 536961600.

The previous prime is 655120603. The next prime is 655120649. The reversal of 655120609 is 906021556.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 655120609 - 2⁷ = 655120481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (655120603) 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, 47122 + ... + 59419.

It is an arithmetic number, because the mean of its divisors is an integer number (49222404).

Almost surely, 2^655120609 is an apocalyptic number.

It is an amenable number.

655120609 is a deficient number, since it is larger than the sum of its proper divisors (132437855).

655120609 is a wasteful number, since it uses less digits than its factorization.

655120609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106608.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 655120609 is about 25595.3239674750. The cubic root of 655120609 is about 868.5078615479.

The spelling of 655120609 in words is "six hundred fifty-five million, one hundred twenty thousand, six hundred nine".