3100872721 has 2 divisors, whose sum is σ = 3100872722. Its totient is φ = 3100872720.

The previous prime is 3100872707. The next prime is 3100872737. The reversal of 3100872721 is 1272780013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2928974400 + 171898321 = 54120^2 + 13111^2 .

It is a cyclic number.

It is not a de Polignac number, because 3100872721 - 2¹¹ = 3100870673 is a prime.

It is not a weakly prime, because it can be changed into another prime (3100872781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1550436360 + 1550436361.

It is an arithmetic number, because the mean of its divisors is an integer number (1550436361).

Almost surely, 2^3100872721 is an apocalyptic number.

It is an amenable number.

3100872721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3100872721 is an equidigital number, since it uses as much as digits as its factorization.

3100872721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 3100872721 is about 55685.4803427249. The cubic root of 3100872721 is about 1458.2365524788.

The spelling of 3100872721 in words is "three billion, one hundred million, eight hundred seventy-two thousand, seven hundred twenty-one".