656841 has 4 divisors (see below), whose sum is σ = 875792. Its totient is φ = 437892.

The previous prime is 656839. The next prime is 656891. The reversal of 656841 is 148656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 656841 - 2¹ = 656839 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656799 and 656808.

It is not an unprimeable number, because it can be changed into a prime (656891) 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, 109471 + ... + 109476.

It is an arithmetic number, because the mean of its divisors is an integer number (218948).

2⁶⁵⁶⁸⁴¹ is an apocalyptic number.

It is an amenable number.

656841 is a deficient number, since it is larger than the sum of its proper divisors (218951).

656841 is a wasteful number, since it uses less digits than its factorization.

656841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218950.

The product of its digits is 5760, while the sum is 30.

The square root of 656841 is about 810.4572783312. The cubic root of 656841 is about 86.9267450474.

The spelling of 656841 in words is "six hundred fifty-six thousand, eight hundred forty-one".