8121434147 has 2 divisors, whose sum is σ = 8121434148. Its totient is φ = 8121434146.

The previous prime is 8121434143. The next prime is 8121434183. The reversal of 8121434147 is 7414341218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8121434147 - 2² = 8121434143 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 (8121434143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060717073 + 4060717074.

It is an arithmetic number, because the mean of its divisors is an integer number (4060717074).

Almost surely, 2^8121434147 is an apocalyptic number.

8121434147 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121434147 is an equidigital number, since it uses as much as digits as its factorization.

8121434147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 35.

The square root of 8121434147 is about 90118.9999223249. Note that the first 4 decimals coincide. The cubic root of 8121434147 is about 2010.0687374495.

The spelling of 8121434147 in words is "eight billion, one hundred twenty-one million, four hundred thirty-four thousand, one hundred forty-seven".