656542841 has 2 divisors, whose sum is σ = 656542842. Its totient is φ = 656542840.

The previous prime is 656542759. The next prime is 656542847. The reversal of 656542841 is 148245656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 458859241 + 197683600 = 21421^2 + 14060^2 .

It is a cyclic number.

It is not a de Polignac number, because 656542841 - 2¹⁸ = 656280697 is a prime.

It is not a weakly prime, because it can be changed into another prime (656542847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328271420 + 328271421.

It is an arithmetic number, because the mean of its divisors is an integer number (328271421).

Almost surely, 2^656542841 is an apocalyptic number.

It is an amenable number.

656542841 is a deficient number, since it is larger than the sum of its proper divisors (1).

656542841 is an equidigital number, since it uses as much as digits as its factorization.

656542841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230400, while the sum is 41.

The square root of 656542841 is about 25623.0919484749. The cubic root of 656542841 is about 869.1359020782.

The spelling of 656542841 in words is "six hundred fifty-six million, five hundred forty-two thousand, eight hundred forty-one".