8721131291 has 16 divisors (see below), whose sum is σ = 9445227264. Its totient is φ = 8021704704.

The previous prime is 8721131273. The next prime is 8721131297. The reversal of 8721131291 is 1921311278.

It is a cyclic number.

It is not a de Polignac number, because 8721131291 - 2¹⁰ = 8721130267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8721131297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212726 + ... + 250388.

It is an arithmetic number, because the mean of its divisors is an integer number (590326704).

Almost surely, 2^8721131291 is an apocalyptic number.

8721131291 is a deficient number, since it is larger than the sum of its proper divisors (724095973).

8721131291 is a wasteful number, since it uses less digits than its factorization.

8721131291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37990.

The product of its digits is 6048, while the sum is 35.

The square root of 8721131291 is about 93386.9974407572. The cubic root of 8721131291 is about 2058.3739399676.

The spelling of 8721131291 in words is "eight billion, seven hundred twenty-one million, one hundred thirty-one thousand, two hundred ninety-one".