71997229 has 2 divisors, whose sum is σ = 71997230. Its totient is φ = 71997228.

The previous prime is 71997223. The next prime is 71997269. The reversal of 71997229 is 92279917.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38415204 + 33582025 = 6198^2 + 5795^2 .

It is a cyclic number.

It is not a de Polignac number, because 71997229 - 2¹¹ = 71995181 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71997223) 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, 35998614 + 35998615.

It is an arithmetic number, because the mean of its divisors is an integer number (35998615).

Almost surely, 2^71997229 is an apocalyptic number.

It is an amenable number.

71997229 is a deficient number, since it is larger than the sum of its proper divisors (1).

71997229 is an equidigital number, since it uses as much as digits as its factorization.

71997229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 46.

The square root of 71997229 is about 8485.1180899266. The cubic root of 71997229 is about 416.0114275861.

The spelling of 71997229 in words is "seventy-one million, nine hundred ninety-seven thousand, two hundred twenty-nine".