656961 has 4 divisors (see below), whose sum is σ = 875952. Its totient is φ = 437972.

The previous prime is 656959. The next prime is 656977. The reversal of 656961 is 169656.

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 a cyclic number.

It is not a de Polignac number, because 656961 - 2¹ = 656959 is a prime.

It is a D-number.

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

It is not an unprimeable number, because it can be changed into a prime (656951) 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, 109491 + ... + 109496.

It is an arithmetic number, because the mean of its divisors is an integer number (218988).

2⁶⁵⁶⁹⁶¹ is an apocalyptic number.

It is an amenable number.

656961 is a deficient number, since it is larger than the sum of its proper divisors (218991).

656961 is a wasteful number, since it uses less digits than its factorization.

656961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218990.

The product of its digits is 9720, while the sum is 33.

The square root of 656961 is about 810.5313072300. The cubic root of 656961 is about 86.9320383499.

The spelling of 656961 in words is "six hundred fifty-six thousand, nine hundred sixty-one".