1001601005 has 4 divisors (see below), whose sum is σ = 1201921212. Its totient is φ = 801280800.

The previous prime is 1001601001. The next prime is 1001601071. The reversal of 1001601005 is 5001061001.

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 465308041 + 536292964 = 21571^2 + 23158^2 .

It is not a de Polignac number, because 1001601005 - 2² = 1001601001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001601001) 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, 100160096 + ... + 100160105.

It is an arithmetic number, because the mean of its divisors is an integer number (300480303).

Almost surely, 2^1001601005 is an apocalyptic number.

It is an amenable number.

1001601005 is a deficient number, since it is larger than the sum of its proper divisors (200320207).

1001601005 is an equidigital number, since it uses as much as digits as its factorization.

1001601005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200320206.

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 1001601005 is about 31648.0805895081. The cubic root of 1001601005 is about 1000.5333837845.

Adding to 1001601005 its reverse (5001061001), we get a palindrome (6002662006).

The spelling of 1001601005 in words is "one billion, one million, six hundred one thousand, five".