656571941 has 2 divisors, whose sum is σ = 656571942. Its totient is φ = 656571940.

The previous prime is 656571913. The next prime is 656571947. The reversal of 656571941 is 149175656.

656571941 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538936225 + 117635716 = 23215^2 + 10846^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656571941 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 656571892 and 656571901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656571947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328285970 + 328285971.

It is an arithmetic number, because the mean of its divisors is an integer number (328285971).

Almost surely, 2^656571941 is an apocalyptic number.

It is an amenable number.

656571941 is a deficient number, since it is larger than the sum of its proper divisors (1).

656571941 is an equidigital number, since it uses as much as digits as its factorization.

656571941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 656571941 is about 25623.6597893431. The cubic root of 656571941 is about 869.1487428148.

The spelling of 656571941 in words is "six hundred fifty-six million, five hundred seventy-one thousand, nine hundred forty-one".