1608128261 has 2 divisors, whose sum is σ = 1608128262. Its totient is φ = 1608128260.

The previous prime is 1608128239. The next prime is 1608128287. The reversal of 1608128261 is 1628218061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1308630625 + 299497636 = 36175^2 + 17306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608128261 - 2¹⁰ = 1608127237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1608128201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804064130 + 804064131.

It is an arithmetic number, because the mean of its divisors is an integer number (804064131).

Almost surely, 2^1608128261 is an apocalyptic number.

It is an amenable number.

1608128261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1608128261 is an equidigital number, since it uses as much as digits as its factorization.

1608128261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 1608128261 is about 40101.4745489489. The cubic root of 1608128261 is about 1171.5843490770.

The spelling of 1608128261 in words is "one billion, six hundred eight million, one hundred twenty-eight thousand, two hundred sixty-one".