8000049991 has 2 divisors, whose sum is σ = 8000049992. Its totient is φ = 8000049990.

The previous prime is 8000049973. The next prime is 8000050001. The reversal of 8000049991 is 1999400008.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8000049991 - 2⁹ = 8000049479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8000049901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4000024995 + 4000024996.

It is an arithmetic number, because the mean of its divisors is an integer number (4000024996).

Almost surely, 2^8000049991 is an apocalyptic number.

8000049991 is a deficient number, since it is larger than the sum of its proper divisors (1).

8000049991 is an equidigital number, since it uses as much as digits as its factorization.

8000049991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 8000049991 is about 89442.9985577407. The cubic root of 8000049991 is about 2000.0041659080.

Adding to 8000049991 its reverse (1999400008), we get a palindrome (9999449999).

The spelling of 8000049991 in words is "eight billion, forty-nine thousand, nine hundred ninety-one".