8129025691 has 2 divisors, whose sum is σ = 8129025692. Its totient is φ = 8129025690.

The previous prime is 8129025659. The next prime is 8129025701. The reversal of 8129025691 is 1965209218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8129025691 - 2⁵ = 8129025659 is a prime.

It is not a weakly prime, because it can be changed into another prime (8129025491) 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 as a sum of consecutive naturals, namely, 4064512845 + 4064512846.

It is an arithmetic number, because the mean of its divisors is an integer number (4064512846).

Almost surely, 2^8129025691 is an apocalyptic number.

8129025691 is a deficient number, since it is larger than the sum of its proper divisors (1).

8129025691 is an equidigital number, since it uses as much as digits as its factorization.

8129025691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 8129025691 is about 90161.1096371379. The cubic root of 8129025691 is about 2010.6948490787.

The spelling of 8129025691 in words is "eight billion, one hundred twenty-nine million, twenty-five thousand, six hundred ninety-one".