656171 has 2 divisors, whose sum is σ = 656172. Its totient is φ = 656170.

The previous prime is 656153. The next prime is 656221. The reversal of 656171 is 171656.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656171 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 656171.

It is not a weakly prime, because it can be changed into another prime (656141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328085 + 328086.

It is an arithmetic number, because the mean of its divisors is an integer number (328086).

2⁶⁵⁶¹⁷¹ is an apocalyptic number.

656171 is a deficient number, since it is larger than the sum of its proper divisors (1).

656171 is an equidigital number, since it uses as much as digits as its factorization.

656171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1260, while the sum is 26.

The square root of 656171 is about 810.0438259749. The cubic root of 656171 is about 86.8971789206.

The spelling of 656171 in words is "six hundred fifty-six thousand, one hundred seventy-one".