971798657 has 2 divisors, whose sum is σ = 971798658. Its totient is φ = 971798656.

The previous prime is 971798651. The next prime is 971798699. The reversal of 971798657 is 756897179.

971798657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 855504001 + 116294656 = 29249^2 + 10784^2 .

It is a cyclic number.

It is not a de Polignac number, because 971798657 - 2¹² = 971794561 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 971798596 and 971798605.

It is not a weakly prime, because it can be changed into another prime (971798651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485899328 + 485899329.

It is an arithmetic number, because the mean of its divisors is an integer number (485899329).

Almost surely, 2^971798657 is an apocalyptic number.

It is an amenable number.

971798657 is a deficient number, since it is larger than the sum of its proper divisors (1).

971798657 is an equidigital number, since it uses as much as digits as its factorization.

971798657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6667920, while the sum is 59.

The square root of 971798657 is about 31173.6853291362. The cubic root of 971798657 is about 990.5097728322.

The spelling of 971798657 in words is "nine hundred seventy-one million, seven hundred ninety-eight thousand, six hundred fifty-seven".