655861 has 4 divisors (see below), whose sum is σ = 690400. Its totient is φ = 621324.

The previous prime is 655859. The next prime is 655883. The reversal of 655861 is 168556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 655861 - 2¹ = 655859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655261) 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, 17241 + ... + 17278.

It is an arithmetic number, because the mean of its divisors is an integer number (172600).

2⁶⁵⁵⁸⁶¹ is an apocalyptic number.

It is an amenable number.

655861 is a deficient number, since it is larger than the sum of its proper divisors (34539).

655861 is a wasteful number, since it uses less digits than its factorization.

655861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34538.

The product of its digits is 7200, while the sum is 31.

The square root of 655861 is about 809.8524556979. The cubic root of 655861 is about 86.8834922603.

The spelling of 655861 in words is "six hundred fifty-five thousand, eight hundred sixty-one".