8721131292 has 18 divisors (see below), whose sum is σ = 22045081968. Its totient is φ = 2907043752.

The previous prime is 8721131273. The next prime is 8721131297. The reversal of 8721131292 is 2921311278.

8721131292 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 242253647 = 8721131292 / (8 + 7 + 2 + 1 + 1 + 3 + 1 + 2 + 9 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721131297) 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 5 ways as a sum of consecutive naturals, for example, 121126788 + ... + 121126859.

It is an arithmetic number, because the mean of its divisors is an integer number (1224726776).

Almost surely, 2^8721131292 is an apocalyptic number.

It is an amenable number.

8721131292 is an abundant number, since it is smaller than the sum of its proper divisors (13323950676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8721131292 is a wasteful number, since it uses less digits than its factorization.

8721131292 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242253657 (or 242253652 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 8721131292 is about 93386.9974461113. The cubic root of 8721131292 is about 2058.3739400463.

The spelling of 8721131292 in words is "eight billion, seven hundred twenty-one million, one hundred thirty-one thousand, two hundred ninety-two".