655909 has 2 divisors, whose sum is σ = 655910. Its totient is φ = 655908.

The previous prime is 655901. The next prime is 655913. The reversal of 655909 is 909556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 605284 + 50625 = 778^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 655909 - 2³ = 655901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327954 + 327955.

It is an arithmetic number, because the mean of its divisors is an integer number (327955).

2⁶⁵⁵⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

655909 is a deficient number, since it is larger than the sum of its proper divisors (1).

655909 is an equidigital number, since it uses as much as digits as its factorization.

655909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 655909 is about 809.8820901835. The cubic root of 655909 is about 86.8856117672.

The spelling of 655909 in words is "six hundred fifty-five thousand, nine hundred nine".