656338549 has 2 divisors, whose sum is σ = 656338550. Its totient is φ = 656338548.

The previous prime is 656338517. The next prime is 656338577. The reversal of 656338549 is 945833656.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 346332100 + 310006449 = 18610^2 + 17607^2 .

It is a cyclic number.

It is not a de Polignac number, because 656338549 - 2⁵ = 656338517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656338049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328169274 + 328169275.

It is an arithmetic number, because the mean of its divisors is an integer number (328169275).

Almost surely, 2^656338549 is an apocalyptic number.

It is an amenable number.

656338549 is a deficient number, since it is larger than the sum of its proper divisors (1).

656338549 is an equidigital number, since it uses as much as digits as its factorization.

656338549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2332800, while the sum is 49.

The square root of 656338549 is about 25619.1051561135. The cubic root of 656338549 is about 869.0457450109.

The spelling of 656338549 in words is "six hundred fifty-six million, three hundred thirty-eight thousand, five hundred forty-nine".