71120309 has 4 divisors (see below), whose sum is σ = 76591116. Its totient is φ = 65649504.

The previous prime is 71120297. The next prime is 71120317. The reversal of 71120309 is 90302117.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21022225 + 50098084 = 4585^2 + 7078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71120309 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 (71120389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2735384 + ... + 2735409.

It is an arithmetic number, because the mean of its divisors is an integer number (19147779).

Almost surely, 2^71120309 is an apocalyptic number.

It is an amenable number.

71120309 is a deficient number, since it is larger than the sum of its proper divisors (5470807).

71120309 is a wasteful number, since it uses less digits than its factorization.

71120309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5470806.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 71120309 is about 8433.2857772045. The cubic root of 71120309 is about 414.3155291775.

The spelling of 71120309 in words is "seventy-one million, one hundred twenty thousand, three hundred nine".