71316209 has 2 divisors, whose sum is σ = 71316210. Its totient is φ = 71316208.

The previous prime is 71316199. The next prime is 71316229. The reversal of 71316209 is 90261317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69222400 + 2093809 = 8320^2 + 1447^2 .

It is an emirp because it is prime and its reverse (90261317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71316209 - 2⁸ = 71315953 is a prime.

It is a super-2 number, since 2×71316209² = 10172003332263362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71316229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35658104 + 35658105.

It is an arithmetic number, because the mean of its divisors is an integer number (35658105).

Almost surely, 2^71316209 is an apocalyptic number.

It is an amenable number.

71316209 is a deficient number, since it is larger than the sum of its proper divisors (1).

71316209 is an equidigital number, since it uses as much as digits as its factorization.

71316209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 71316209 is about 8444.8924800734. The cubic root of 71316209 is about 414.6955894117.

The spelling of 71316209 in words is "seventy-one million, three hundred sixteen thousand, two hundred nine".