1601601611 has 2 divisors, whose sum is σ = 1601601612. Its totient is φ = 1601601610.

The previous prime is 1601601593. The next prime is 1601601613. The reversal of 1601601611 is 1161061061.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601601611 is a prime.

Together with 1601601613, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1601601613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800800805 + 800800806.

It is an arithmetic number, because the mean of its divisors is an integer number (800800806).

Almost surely, 2^1601601611 is an apocalyptic number.

1601601611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601601611 is an equidigital number, since it uses as much as digits as its factorization.

1601601611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1601601611 is about 40020.0151299322. The cubic root of 1601601611 is about 1169.9972267205.

Adding to 1601601611 its reverse (1161061061), we get a palindrome (2762662672).

The spelling of 1601601611 in words is "one billion, six hundred one million, six hundred one thousand, six hundred eleven".