655649009 has 2 divisors, whose sum is σ = 655649010. Its totient is φ = 655649008.

The previous prime is 655648963. The next prime is 655649083. The reversal of 655649009 is 900946556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 654592225 + 1056784 = 25585^2 + 1028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655649009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655649089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327824504 + 327824505.

It is an arithmetic number, because the mean of its divisors is an integer number (327824505).

Almost surely, 2^655649009 is an apocalyptic number.

It is an amenable number.

655649009 is a deficient number, since it is larger than the sum of its proper divisors (1).

655649009 is an equidigital number, since it uses as much as digits as its factorization.

655649009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 291600, while the sum is 44.

The square root of 655649009 is about 25605.6440848497. The cubic root of 655649009 is about 868.7413026474.

The spelling of 655649009 in words is "six hundred fifty-five million, six hundred forty-nine thousand, nine".