1608655649 has 2 divisors, whose sum is σ = 1608655650. Its totient is φ = 1608655648.

The previous prime is 1608655621. The next prime is 1608655661. The reversal of 1608655649 is 9465568061.

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., 1315150225 + 293505424 = 36265^2 + 17132^2 .

It is an emirp because it is prime and its reverse (9465568061) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1608655649 is a prime.

It is a super-2 number, since 2×1608655649² = 5175545994119222402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1608655597 and 1608655606.

It is not a weakly prime, because it can be changed into another prime (1608655679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804327824 + 804327825.

It is an arithmetic number, because the mean of its divisors is an integer number (804327825).

Almost surely, 2^1608655649 is an apocalyptic number.

It is an amenable number.

1608655649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1608655649 is an equidigital number, since it uses as much as digits as its factorization.

1608655649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The square root of 1608655649 is about 40108.0496783376. The cubic root of 1608655649 is about 1171.7124093421.

The spelling of 1608655649 in words is "one billion, six hundred eight million, six hundred fifty-five thousand, six hundred forty-nine".