971917567 has 2 divisors, whose sum is σ = 971917568. Its totient is φ = 971917566.

The previous prime is 971917537. The next prime is 971917589. The reversal of 971917567 is 765719179.

It is a strong prime.

It is an emirp because it is prime and its reverse (765719179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 971917567 - 2⁷ = 971917439 is a prime.

It is a super-4 number, since 4×971917567⁴ (a number of 37 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971917537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485958783 + 485958784.

It is an arithmetic number, because the mean of its divisors is an integer number (485958784).

Almost surely, 2^971917567 is an apocalyptic number.

971917567 is a deficient number, since it is larger than the sum of its proper divisors (1).

971917567 is an equidigital number, since it uses as much as digits as its factorization.

971917567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 833490, while the sum is 52.

The square root of 971917567 is about 31175.5924883554. The cubic root of 971917567 is about 990.5501710198.

The spelling of 971917567 in words is "nine hundred seventy-one million, nine hundred seventeen thousand, five hundred sixty-seven".