71120009 has 2 divisors, whose sum is σ = 71120010. Its totient is φ = 71120008.

The previous prime is 71120003. The next prime is 71120017. The reversal of 71120009 is 90002117.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67980025 + 3139984 = 8245^2 + 1772^2 .

It is an emirp because it is prime and its reverse (90002117) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71120009 - 2⁸ = 71119753 is a prime.

It is not a weakly prime, because it can be changed into another prime (71120003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35560004 + 35560005.

It is an arithmetic number, because the mean of its divisors is an integer number (35560005).

Almost surely, 2^71120009 is an apocalyptic number.

It is an amenable number.

71120009 is a deficient number, since it is larger than the sum of its proper divisors (1).

71120009 is an equidigital number, since it uses as much as digits as its factorization.

71120009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 20.

The square root of 71120009 is about 8433.2679905242. The cubic root of 71120009 is about 414.3149466208.

The spelling of 71120009 in words is "seventy-one million, one hundred twenty thousand, nine".