7997997971 has 2 divisors, whose sum is σ = 7997997972. Its totient is φ = 7997997970.

The previous prime is 7997997949. The next prime is 7997997977. The reversal of 7997997971 is 1797997997.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7997997971 - 2⁶ = 7997997907 is a prime.

It is not a weakly prime, because it can be changed into another prime (7997997977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3998998985 + 3998998986.

It is an arithmetic number, because the mean of its divisors is an integer number (3998998986).

Almost surely, 2^7997997971 is an apocalyptic number.

7997997971 is a deficient number, since it is larger than the sum of its proper divisors (1).

7997997971 is an equidigital number, since it uses as much as digits as its factorization.

7997997971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141776649, while the sum is 74.

The square root of 7997997971 is about 89431.5267173719. The cubic root of 7997997971 is about 1999.8331503310.

The spelling of 7997997971 in words is "seven billion, nine hundred ninety-seven million, nine hundred ninety-seven thousand, nine hundred seventy-one".