1601601613 has 2 divisors, whose sum is σ = 1601601614. Its totient is φ = 1601601612.

The previous prime is 1601601611. The next prime is 1601601623. The reversal of 1601601613 is 3161061061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1301549929 + 300051684 = 36077^2 + 17322^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601601613 - 2¹ = 1601601611 is a prime.

Together with 1601601611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601601611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800800806 + 800800807.

It is an arithmetic number, because the mean of its divisors is an integer number (800800807).

Almost surely, 2^1601601613 is an apocalyptic number.

It is an amenable number.

1601601613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601601613 is an equidigital number, since it uses as much as digits as its factorization.

1601601613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1601601613 is about 40020.0151549197. The cubic root of 1601601613 is about 1169.9972272075.

Adding to 1601601613 its reverse (3161061061), we get a palindrome (4762662674).

The spelling of 1601601613 in words is "one billion, six hundred one million, six hundred one thousand, six hundred thirteen".