8078138291 has 2 divisors, whose sum is σ = 8078138292. Its totient is φ = 8078138290.

The previous prime is 8078138219. The next prime is 8078138309. The reversal of 8078138291 is 1928318708.

Together with previous prime (8078138219) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8078138291 - 2²² = 8073943987 is a prime.

It is not a weakly prime, because it can be changed into another prime (8078138191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4039069145 + 4039069146.

It is an arithmetic number, because the mean of its divisors is an integer number (4039069146).

Almost surely, 2^8078138291 is an apocalyptic number.

8078138291 is a deficient number, since it is larger than the sum of its proper divisors (1).

8078138291 is an equidigital number, since it uses as much as digits as its factorization.

8078138291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 8078138291 is about 89878.4640000039. The cubic root of 8078138291 is about 2006.4904385690.

The spelling of 8078138291 in words is "eight billion, seventy-eight million, one hundred thirty-eight thousand, two hundred ninety-one".