656041 has 4 divisors (see below), whose sum is σ = 672084. Its totient is φ = 640000.

The previous prime is 656039. The next prime is 656063. The reversal of 656041 is 140656.

656041 = T₁₅₈ + T₁₅₉ + ... + T₁₉₈.

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 270400 + 385641 = 520^2 + 621^2 .

It is a 4-Lehmer number, since φ(656041) divides (656041-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 656041 - 2¹ = 656039 is a prime.

It is an Ulam number.

It is a Duffinian number.

656041 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (656141) 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, 7960 + ... + 8041.

It is an arithmetic number, because the mean of its divisors is an integer number (168021).

2⁶⁵⁶⁰⁴¹ is an apocalyptic number.

It is an amenable number.

656041 is a deficient number, since it is larger than the sum of its proper divisors (16043).

656041 is a wasteful number, since it uses less digits than its factorization.

656041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16042.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 656041 is about 809.9635794281. The cubic root of 656041 is about 86.8914398783.

Adding to 656041 its reverse (140656), we get a palindrome (796697).

The spelling of 656041 in words is "six hundred fifty-six thousand, forty-one".