655881 has 4 divisors (see below), whose sum is σ = 874512. Its totient is φ = 437252.

The previous prime is 655859. The next prime is 655883. The reversal of 655881 is 188556.

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 655881 - 2⁵ = 655849 is a prime.

It is a super-2 number, since 2×655881² = 860359772322, which contains 22 as substring.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655881.

It is not an unprimeable number, because it can be changed into a prime (655883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109311 + ... + 109316.

It is an arithmetic number, because the mean of its divisors is an integer number (218628).

2⁶⁵⁵⁸⁸¹ is an apocalyptic number.

It is an amenable number.

655881 is a deficient number, since it is larger than the sum of its proper divisors (218631).

655881 is a wasteful number, since it uses less digits than its factorization.

655881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218630.

The product of its digits is 9600, while the sum is 33.

The square root of 655881 is about 809.8648035320. The cubic root of 655881 is about 86.8843754007.

The spelling of 655881 in words is "six hundred fifty-five thousand, eight hundred eighty-one".