3121647005 has 4 divisors (see below), whose sum is σ = 3745976412. Its totient is φ = 2497317600.

The previous prime is 3121646993. The next prime is 3121647007. The reversal of 3121647005 is 5007461213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5007461213 = 463 ⋅10815251.

It can be written as a sum of positive squares in 2 ways, for example, as 1979004196 + 1142642809 = 44486^2 + 33803^2 .

It is not a de Polignac number, because 3121647005 - 2²⁶ = 3054538141 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 (3121647007) 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, 312164696 + ... + 312164705.

It is an arithmetic number, because the mean of its divisors is an integer number (936494103).

Almost surely, 2^3121647005 is an apocalyptic number.

It is an amenable number.

3121647005 is a deficient number, since it is larger than the sum of its proper divisors (624329407).

3121647005 is an equidigital number, since it uses as much as digits as its factorization.

3121647005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624329406.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 3121647005 is about 55871.7012896511. The cubic root of 3121647005 is about 1461.4857904156.

The spelling of 3121647005 in words is "three billion, one hundred twenty-one million, six hundred forty-seven thousand, five".