71287009 has 2 divisors, whose sum is σ = 71287010. Its totient is φ = 71287008.

The previous prime is 71286997. The next prime is 71287019. The reversal of 71287009 is 90078217.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64448784 + 6838225 = 8028^2 + 2615^2 .

It is a cyclic number.

It is not a de Polignac number, because 71287009 - 2⁷ = 71286881 is a prime.

It is not a weakly prime, because it can be changed into another prime (71287019) 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, 35643504 + 35643505.

It is an arithmetic number, because the mean of its divisors is an integer number (35643505).

Almost surely, 2^71287009 is an apocalyptic number.

It is an amenable number.

71287009 is a deficient number, since it is larger than the sum of its proper divisors (1).

71287009 is an equidigital number, since it uses as much as digits as its factorization.

71287009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 71287009 is about 8443.1634474289. The cubic root of 71287009 is about 414.6389834665.

The spelling of 71287009 in words is "seventy-one million, two hundred eighty-seven thousand, nine".