1608442217 has 2 divisors, whose sum is σ = 1608442218. Its totient is φ = 1608442216.

The previous prime is 1608442193. The next prime is 1608442229. The reversal of 1608442217 is 7122448061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 984641641 + 623800576 = 31379^2 + 24976^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608442217 - 2⁶ = 1608442153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1608442237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804221108 + 804221109.

It is an arithmetic number, because the mean of its divisors is an integer number (804221109).

Almost surely, 2^1608442217 is an apocalyptic number.

It is an amenable number.

1608442217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1608442217 is an equidigital number, since it uses as much as digits as its factorization.

1608442217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 1608442217 is about 40105.3888773068. The cubic root of 1608442217 is about 1171.6605871919.

The spelling of 1608442217 in words is "one billion, six hundred eight million, four hundred forty-two thousand, two hundred seventeen".