8121711492 has 36 divisors (see below), whose sum is σ = 21084746956. Its totient is φ = 2634068160.

The previous prime is 8121711491. The next prime is 8121711503. The reversal of 8121711492 is 2941171218.

8121711492 is a `hidden beast` number, since 81 + 21 + 71 + 1 + 492 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3654927936 + 4466783556 = 60456^2 + 66834^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (8121711491) 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 11 ways as a sum of consecutive naturals, for example, 3047359 + ... + 3050022.

Almost surely, 2^8121711492 is an apocalyptic number.

It is an amenable number.

8121711492 is an abundant number, since it is smaller than the sum of its proper divisors (12963035464).

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

8121711492 is a wasteful number, since it uses less digits than its factorization.

8121711492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6097428 (or 6097423 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 8121711492 is about 90120.5386801477. The cubic root of 8121711492 is about 2010.0916183085.

The spelling of 8121711492 in words is "eight billion, one hundred twenty-one million, seven hundred eleven thousand, four hundred ninety-two".