71133809 has 8 divisors (see below), whose sum is σ = 73743360. Its totient is φ = 68544000.

The previous prime is 71133793. The next prime is 71133823. The reversal of 71133809 is 90833117.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71133809 - 2⁴ = 71133793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71133859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2609 + ... + 12209.

It is an arithmetic number, because the mean of its divisors is an integer number (9217920).

Almost surely, 2^71133809 is an apocalyptic number.

It is an amenable number.

71133809 is a deficient number, since it is larger than the sum of its proper divisors (2609551).

71133809 is a wasteful number, since it uses less digits than its factorization.

71133809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9871.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 71133809 is about 8434.0861389957. The cubic root of 71133809 is about 414.3417425328.

The spelling of 71133809 in words is "seventy-one million, one hundred thirty-three thousand, eight hundred nine".