8121530747 has 32 divisors (see below), whose sum is σ = 9304326144. Its totient is φ = 7023542400.

The previous prime is 8121530731. The next prime is 8121530777. The reversal of 8121530747 is 7470351218.

It is a cyclic number.

It is not a de Polignac number, because 8121530747 - 2⁴ = 8121530731 is a prime.

It is a Smith number, since the sum of its digits (38) 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 a self number, because there is not a number n which added to its sum of digits gives 8121530747.

It is not an unprimeable number, because it can be changed into a prime (8121530777) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3668813 + ... + 3671025.

It is an arithmetic number, because the mean of its divisors is an integer number (290760192).

Almost surely, 2^8121530747 is an apocalyptic number.

8121530747 is a deficient number, since it is larger than the sum of its proper divisors (1182795397).

8121530747 is a wasteful number, since it uses less digits than its factorization.

8121530747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 8121530747 is about 90119.5358787427. The cubic root of 8121530747 is about 2010.0767069725.

The spelling of 8121530747 in words is "eight billion, one hundred twenty-one million, five hundred thirty thousand, seven hundred forty-seven".