655971 has 4 divisors (see below), whose sum is σ = 874632. Its totient is φ = 437312.

The previous prime is 655961. The next prime is 655987. The reversal of 655971 is 179556.

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

It is a cyclic number.

It is not a de Polignac number, because 655971 - 2¹⁷ = 524899 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (655901) 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 3 ways as a sum of consecutive naturals, for example, 109326 + ... + 109331.

It is an arithmetic number, because the mean of its divisors is an integer number (218658).

2⁶⁵⁵⁹⁷¹ is an apocalyptic number.

655971 is a deficient number, since it is larger than the sum of its proper divisors (218661).

655971 is a wasteful number, since it uses less digits than its factorization.

655971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218660.

The product of its digits is 9450, while the sum is 33.

The square root of 655971 is about 809.9203664559. The cubic root of 655971 is about 86.8883493107. Note that the first 3 decimals are identical.

The spelling of 655971 in words is "six hundred fifty-five thousand, nine hundred seventy-one".