1331648005 has 4 divisors (see below), whose sum is σ = 1597977612. Its totient is φ = 1065318400.

The previous prime is 1331647991. The next prime is 1331648009. The reversal of 1331648005 is 5008461331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5008461331 = 19501 ⋅256831.

It can be written as a sum of positive squares in 2 ways, for example, as 370524001 + 961124004 = 19249^2 + 31002^2 .

It is not a de Polignac number, because 1331648005 - 2¹¹ = 1331645957 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 (1331648009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133164796 + ... + 133164805.

It is an arithmetic number, because the mean of its divisors is an integer number (399494403).

Almost surely, 2^1331648005 is an apocalyptic number.

It is an amenable number.

1331648005 is a deficient number, since it is larger than the sum of its proper divisors (266329607).

1331648005 is an equidigital number, since it uses as much as digits as its factorization.

1331648005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266329606.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1331648005 is about 36491.7525613665. The cubic root of 1331648005 is about 1100.1784848118.

The spelling of 1331648005 in words is "one billion, three hundred thirty-one million, six hundred forty-eight thousand, five".