656501 has 4 divisors (see below), whose sum is σ = 660000. Its totient is φ = 653004.

The previous prime is 656483. The next prime is 656519. The reversal of 656501 is 105656.

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 an interprime number because it is at equal distance from previous prime (656483) and next prime (656519).

It is a cyclic number.

It is not a de Polignac number, because 656501 - 2¹⁸ = 394357 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 an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 656501.

It is not an unprimeable number, because it can be changed into a prime (656561) 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, 1451 + ... + 1848.

It is an arithmetic number, because the mean of its divisors is an integer number (165000).

2⁶⁵⁶⁵⁰¹ is an apocalyptic number.

It is an amenable number.

656501 is a deficient number, since it is larger than the sum of its proper divisors (3499).

656501 is a wasteful number, since it uses less digits than its factorization.

656501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3498.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 656501 is about 810.2474930538. The cubic root of 656501 is about 86.9117438552.

The spelling of 656501 in words is "six hundred fifty-six thousand, five hundred one".