1601001005 has 16 divisors (see below), whose sum is σ = 1988373744. Its totient is φ = 1236664320.

The previous prime is 1601001001. The next prime is 1601001013. The reversal of 1601001005 is 5001001061.

It can be written as a sum of positive squares in 8 ways, for example, as 718079209 + 882921796 = 26797^2 + 29714^2 .

It is not a de Polignac number, because 1601001005 - 2² = 1601001001 is a prime.

It is a super-2 number, since 2×1601001005² = 5126408436022020050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601001001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20372 + ... + 60141.

It is an arithmetic number, because the mean of its divisors is an integer number (124273359).

Almost surely, 2^1601001005 is an apocalyptic number.

It is an amenable number.

1601001005 is a deficient number, since it is larger than the sum of its proper divisors (387372739).

1601001005 is an equidigital number, since it uses as much as digits as its factorization.

1601001005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80656.

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

The square root of 1601001005 is about 40012.5106060592. The cubic root of 1601001005 is about 1169.8509574679.

Adding to 1601001005 its reverse (5001001061), we get a palindrome (6602002066).

The spelling of 1601001005 in words is "one billion, six hundred one million, one thousand, five".