1601116609 has 4 divisors (see below), whose sum is σ = 1605232980. Its totient is φ = 1597000240.

The previous prime is 1601116511. The next prime is 1601116631. The reversal of 1601116609 is 9066111061.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 175827600 + 1425289009 = 13260^2 + 37753^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601116609 - 2¹⁷ = 1600985537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601116109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2057602 + ... + 2058379.

It is an arithmetic number, because the mean of its divisors is an integer number (401308245).

Almost surely, 2^1601116609 is an apocalyptic number.

It is an amenable number.

1601116609 is a deficient number, since it is larger than the sum of its proper divisors (4116371).

1601116609 is an equidigital number, since it uses as much as digits as its factorization.

1601116609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4116370.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 1601116609 is about 40013.9551781625. The cubic root of 1601116609 is about 1169.8791140596.

The spelling of 1601116609 in words is "one billion, six hundred one million, one hundred sixteen thousand, six hundred nine".