1605201617 has 2 divisors, whose sum is σ = 1605201618. Its totient is φ = 1605201616.

The previous prime is 1605201593. The next prime is 1605201623. The reversal of 1605201617 is 7161025061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1511576641 + 93624976 = 38879^2 + 9676^2 .

It is an emirp because it is prime and its reverse (7161025061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1605201617 - 2⁸ = 1605201361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1605201617.

It is not a weakly prime, because it can be changed into another prime (1605201667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802600808 + 802600809.

It is an arithmetic number, because the mean of its divisors is an integer number (802600809).

Almost surely, 2^1605201617 is an apocalyptic number.

It is an amenable number.

1605201617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605201617 is an equidigital number, since it uses as much as digits as its factorization.

1605201617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 1605201617 is about 40064.9674528758. The cubic root of 1605201617 is about 1170.8731926074.

Adding to 1605201617 its reverse (7161025061), we get a palindrome (8766226678).

The spelling of 1605201617 in words is "one billion, six hundred five million, two hundred one thousand, six hundred seventeen".