8121247679 has 2 divisors, whose sum is σ = 8121247680. Its totient is φ = 8121247678.

The previous prime is 8121247639. The next prime is 8121247711. The reversal of 8121247679 is 9767421218.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8121247679 - 2⁸ = 8121247423 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8121247639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060623839 + 4060623840.

It is an arithmetic number, because the mean of its divisors is an integer number (4060623840).

Almost surely, 2^8121247679 is an apocalyptic number.

8121247679 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121247679 is an equidigital number, since it uses as much as digits as its factorization.

8121247679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 47.

The square root of 8121247679 is about 90117.9653509776. The cubic root of 8121247679 is about 2010.0533536162.

The spelling of 8121247679 in words is "eight billion, one hundred twenty-one million, two hundred forty-seven thousand, six hundred seventy-nine".