71317289 has 2 divisors, whose sum is σ = 71317290. Its totient is φ = 71317288.

The previous prime is 71317249. The next prime is 71317291. The reversal of 71317289 is 98271317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45225625 + 26091664 = 6725^2 + 5108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71317289 is a prime.

Together with 71317291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71317219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35658644 + 35658645.

It is an arithmetic number, because the mean of its divisors is an integer number (35658645).

Almost surely, 2^71317289 is an apocalyptic number.

It is an amenable number.

71317289 is a deficient number, since it is larger than the sum of its proper divisors (1).

71317289 is an equidigital number, since it uses as much as digits as its factorization.

71317289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 71317289 is about 8444.9564238071. The cubic root of 71317289 is about 414.6976827599.

The spelling of 71317289 in words is "seventy-one million, three hundred seventeen thousand, two hundred eighty-nine".