8121434129 has 2 divisors, whose sum is σ = 8121434130. Its totient is φ = 8121434128.

The previous prime is 8121434093. The next prime is 8121434143. The reversal of 8121434129 is 9214341218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8103600400 + 17833729 = 90020^2 + 4223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8121434129 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (8121454129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060717064 + 4060717065.

It is an arithmetic number, because the mean of its divisors is an integer number (4060717065).

Almost surely, 2^8121434129 is an apocalyptic number.

It is an amenable number.

8121434129 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121434129 is an equidigital number, since it uses as much as digits as its factorization.

8121434129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 35.

The square root of 8121434129 is about 90118.9998224570. Note that the first 3 decimals coincide. The cubic root of 8121434129 is about 2010.0687359645.

The spelling of 8121434129 in words is "eight billion, one hundred twenty-one million, four hundred thirty-four thousand, one hundred twenty-nine".