656143 has 4 divisors (see below), whose sum is σ = 660240.
Its totient is φ = 652048.
The previous prime is 656141. The next prime is 656147. The reversal of 656143 is 341656.
Adding to 656143 its reverse (341656), we get a palindrome (997799).
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 656143 - 21 = 656141 is a prime.
It is an alternating number because its digits alternate between even and odd.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (656141) 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, 1798 + ... + 2131.
It is an arithmetic number, because the mean of its divisors is an integer number (165060).
2656143 is an apocalyptic number.
656143 is a deficient number, since it is larger than the sum of its proper divisors (4097).
656143 is a wasteful number, since it uses less digits than its factorization.
656143 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4096.
The product of its digits is 2160, while the sum is 25.
The square root of 656143 is about 810.0265427750.
The cubic root of 656143 is about 86.8959428832.
The spelling of 656143 in words is "six hundred fifty-six thousand, one hundred forty-three".