71047109 has 6 divisors (see below), whose sum is σ = 82646694. Its totient is φ = 60897480.

The previous prime is 71047043. The next prime is 71047117. The reversal of 71047109 is 90174017.

It can be written as a sum of positive squares in only one way, i.e., 43850884 + 27196225 = 6622^2 + 5215^2 .

It is not a de Polignac number, because 71047109 - 2¹² = 71043013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71047139) 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 in 5 ways as a sum of consecutive naturals, for example, 724922 + ... + 725019.

It is an arithmetic number, because the mean of its divisors is an integer number (13774449).

Almost surely, 2^71047109 is an apocalyptic number.

It is an amenable number.

71047109 is a deficient number, since it is larger than the sum of its proper divisors (11599585).

71047109 is a wasteful number, since it uses less digits than its factorization.

71047109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449955 (or 1449948 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 71047109 is about 8428.9447144942. The cubic root of 71047109 is about 414.1733367525.

The spelling of 71047109 in words is "seventy-one million, forty-seven thousand, one hundred nine".