71347321 has 2 divisors, whose sum is σ = 71347322. Its totient is φ = 71347320.

The previous prime is 71347319. The next prime is 71347333. The reversal of 71347321 is 12374317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67831696 + 3515625 = 8236^2 + 1875^2 .

It is a cyclic number.

It is not a de Polignac number, because 71347321 - 2¹ = 71347319 is a prime.

Together with 71347319, 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 71347321.

It is not a weakly prime, because it can be changed into another prime (71347361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35673660 + 35673661.

It is an arithmetic number, because the mean of its divisors is an integer number (35673661).

Almost surely, 2^71347321 is an apocalyptic number.

It is an amenable number.

71347321 is a deficient number, since it is larger than the sum of its proper divisors (1).

71347321 is an equidigital number, since it uses as much as digits as its factorization.

71347321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 28.

The square root of 71347321 is about 8446.7343393764. The cubic root of 71347321 is about 414.7558848837.

The spelling of 71347321 in words is "seventy-one million, three hundred forty-seven thousand, three hundred twenty-one".