7971942697 has 2 divisors, whose sum is σ = 7971942698. Its totient is φ = 7971942696.

The previous prime is 7971942691. The next prime is 7971942739. The reversal of 7971942697 is 7962491797.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5694362521 + 2277580176 = 75461^2 + 47724^2 .

It is a cyclic number.

It is not a de Polignac number, because 7971942697 - 2⁷ = 7971942569 is a prime.

It is not a weakly prime, because it can be changed into another prime (7971942691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3985971348 + 3985971349.

It is an arithmetic number, because the mean of its divisors is an integer number (3985971349).

Almost surely, 2^7971942697 is an apocalyptic number.

It is an amenable number.

7971942697 is a deficient number, since it is larger than the sum of its proper divisors (1).

7971942697 is an equidigital number, since it uses as much as digits as its factorization.

7971942697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12002256, while the sum is 61.

The square root of 7971942697 is about 89285.7362460544. The cubic root of 7971942697 is about 1997.6591527025.

The spelling of 7971942697 in words is "seven billion, nine hundred seventy-one million, nine hundred forty-two thousand, six hundred ninety-seven".