71275809 has 16 divisors (see below), whose sum is σ = 104255424. Its totient is φ = 42955200.

The previous prime is 71275793. The next prime is 71275817. The reversal of 71275809 is 90857217.

It is not a de Polignac number, because 71275809 - 2⁴ = 71275793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71275879) 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 15 ways as a sum of consecutive naturals, for example, 7 + ... + 11939.

It is an arithmetic number, because the mean of its divisors is an integer number (6515964).

Almost surely, 2^71275809 is an apocalyptic number.

It is an amenable number.

71275809 is a deficient number, since it is larger than the sum of its proper divisors (32979615).

71275809 is a wasteful number, since it uses less digits than its factorization.

71275809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12128.

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 71275809 is about 8442.5001628664. The cubic root of 71275809 is about 414.6172674956.

The spelling of 71275809 in words is "seventy-one million, two hundred seventy-five thousand, eight hundred nine".