71317247 has 2 divisors, whose sum is σ = 71317248. Its totient is φ = 71317246.

The previous prime is 71317219. The next prime is 71317249. The reversal of 71317247 is 74271317.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71317247 is a prime.

It is a super-2 number, since 2×71317247² = 10172299439318018, which contains 22 as substring.

Together with 71317249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71317249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35658623 + 35658624.

It is an arithmetic number, because the mean of its divisors is an integer number (35658624).

Almost surely, 2^71317247 is an apocalyptic number.

71317247 is a deficient number, since it is larger than the sum of its proper divisors (1).

71317247 is an equidigital number, since it uses as much as digits as its factorization.

71317247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8232, while the sum is 32.

The square root of 71317247 is about 8444.9539371153. The cubic root of 71317247 is about 414.6976013523.

The spelling of 71317247 in words is "seventy-one million, three hundred seventeen thousand, two hundred forty-seven".