656189 has 4 divisors (see below), whose sum is σ = 660156. Its totient is φ = 652224.

The previous prime is 656171. The next prime is 656221. The reversal of 656189 is 981656.

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

It can be written as a sum of positive squares in 2 ways, for example, as 372100 + 284089 = 610^2 + 533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656189 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1724 + ... + 2069.

It is an arithmetic number, because the mean of its divisors is an integer number (165039).

2⁶⁵⁶¹⁸⁹ is an apocalyptic number.

It is an amenable number.

656189 is a deficient number, since it is larger than the sum of its proper divisors (3967).

656189 is a wasteful number, since it uses less digits than its factorization.

656189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3966.

The product of its digits is 12960, while the sum is 35.

The square root of 656189 is about 810.0549364086. The cubic root of 656189 is about 86.8979734975.

The spelling of 656189 in words is "six hundred fifty-six thousand, one hundred eighty-nine".