656461 has 4 divisors (see below), whose sum is σ = 706972. Its totient is φ = 605952.

The previous prime is 656459. The next prime is 656471. The reversal of 656461 is 164656.

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 86436 + 570025 = 294^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 656461 - 2¹ = 656459 is a prime.

It is a Duffinian number.

656461 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25236 + ... + 25261.

It is an arithmetic number, because the mean of its divisors is an integer number (176743).

2⁶⁵⁶⁴⁶¹ is an apocalyptic number.

It is an amenable number.

656461 is a deficient number, since it is larger than the sum of its proper divisors (50511).

656461 is a wasteful number, since it uses less digits than its factorization.

656461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50510.

The product of its digits is 4320, while the sum is 28.

The square root of 656461 is about 810.2228088619. Note that the first 3 decimals coincide. The cubic root of 656461 is about 86.9099786686.

The spelling of 656461 in words is "six hundred fifty-six thousand, four hundred sixty-one".