71217229 has 2 divisors, whose sum is σ = 71217230. Its totient is φ = 71217228.

The previous prime is 71217227. The next prime is 71217247. The reversal of 71217229 is 92271217.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46267204 + 24950025 = 6802^2 + 4995^2 .

It is a cyclic number.

It is not a de Polignac number, because 71217229 - 2¹ = 71217227 is a prime.

Together with 71217227, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 71217229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71217227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35608614 + 35608615.

It is an arithmetic number, because the mean of its divisors is an integer number (35608615).

Almost surely, 2^71217229 is an apocalyptic number.

It is an amenable number.

71217229 is a deficient number, since it is larger than the sum of its proper divisors (1).

71217229 is an equidigital number, since it uses as much as digits as its factorization.

71217229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 31.

The square root of 71217229 is about 8439.0300982992. The cubic root of 71217229 is about 414.5036481301.

The spelling of 71217229 in words is "seventy-one million, two hundred seventeen thousand, two hundred twenty-nine".