655571 has 12 divisors (see below), whose sum is σ = 808488. Its totient is φ = 528192.

The previous prime is 655561. The next prime is 655579. The reversal of 655571 is 175556.

It is not a de Polignac number, because 655571 - 2⁶ = 655507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 440 + ... + 1226.

It is an arithmetic number, because the mean of its divisors is an integer number (67374).

2⁶⁵⁵⁵⁷¹ is an apocalyptic number.

655571 is a deficient number, since it is larger than the sum of its proper divisors (152917).

655571 is a wasteful number, since it uses less digits than its factorization.

655571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818 (or 811 counting only the distinct ones).

The product of its digits is 5250, while the sum is 29.

The square root of 655571 is about 809.6733909423. The cubic root of 655571 is about 86.8706847053.

The spelling of 655571 in words is "six hundred fifty-five thousand, five hundred seventy-one".