71667217 has 2 divisors, whose sum is σ = 71667218. Its totient is φ = 71667216.

The previous prime is 71667191. The next prime is 71667293. The reversal of 71667217 is 71276617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61324561 + 10342656 = 7831^2 + 3216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71667217 is a prime.

It is not a weakly prime, because it can be changed into another prime (71667917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35833608 + 35833609.

It is an arithmetic number, because the mean of its divisors is an integer number (35833609).

Almost surely, 2^71667217 is an apocalyptic number.

It is an amenable number.

71667217 is a deficient number, since it is larger than the sum of its proper divisors (1).

71667217 is an equidigital number, since it uses as much as digits as its factorization.

71667217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 37.

The square root of 71667217 is about 8465.6492367686. The cubic root of 71667217 is about 415.3748333571.

The spelling of 71667217 in words is "seventy-one million, six hundred sixty-seven thousand, two hundred seventeen".