3081571680721 has 4 divisors (see below), whose sum is σ = 3081869801892. Its totient is φ = 3081273559552.

The previous prime is 3081571680623. The next prime is 3081571680793. The reversal of 3081571680721 is 1270861751803.

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 723086619025 + 2358485061696 = 850345^2 + 1535736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3081571680721 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3081571650721) 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, 149045080 + ... + 149065753.

It is an arithmetic number, because the mean of its divisors is an integer number (770467450473).

Almost surely, 2^{3081571680721} is an apocalyptic number.

It is an amenable number.

3081571680721 is a deficient number, since it is larger than the sum of its proper divisors (298121171).

3081571680721 is a wasteful number, since it uses less digits than its factorization.

3081571680721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298121170.

The product of its (nonzero) digits is 564480, while the sum is 49.

The spelling of 3081571680721 in words is "three trillion, eighty-one billion, five hundred seventy-one million, six hundred eighty thousand, seven hundred twenty-one".