655871 has 4 divisors (see below), whose sum is σ = 657552. Its totient is φ = 654192.

The previous prime is 655859. The next prime is 655883. The reversal of 655871 is 178556.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (655859) and next prime (655883).

It is a cyclic number.

It is not a de Polignac number, because 655871 - 2⁶ = 655807 is a prime.

It is a Duffinian number.

Its product of digits (8400) is a multiple of the sum of its prime divisors (1680).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 655871.

It is not an unprimeable number, because it can be changed into a prime (655471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86 + ... + 1148.

It is an arithmetic number, because the mean of its divisors is an integer number (164388).

2⁶⁵⁵⁸⁷¹ is an apocalyptic number.

655871 is a deficient number, since it is larger than the sum of its proper divisors (1681).

655871 is a wasteful number, since it uses less digits than its factorization.

655871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680.

The product of its digits is 8400, while the sum is 32.

The square root of 655871 is about 809.8586296385. The cubic root of 655871 is about 86.8839338327.

The spelling of 655871 in words is "six hundred fifty-five thousand, eight hundred seventy-one".