71947271 has 16 divisors (see below), whose sum is σ = 80593920. Its totient is φ = 63667680.

The previous prime is 71947259. The next prime is 71947279. The reversal of 71947271 is 17274917.

It is a cyclic number.

It is not a de Polignac number, because 71947271 - 2⁶ = 71947207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71947279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163670 + ... + 164108.

It is an arithmetic number, because the mean of its divisors is an integer number (5037120).

Almost surely, 2^71947271 is an apocalyptic number.

71947271 is a deficient number, since it is larger than the sum of its proper divisors (8646649).

71947271 is a wasteful number, since it uses less digits than its factorization.

71947271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814.

The product of its digits is 24696, while the sum is 38.

The square root of 71947271 is about 8482.1737190416. The cubic root of 71947271 is about 415.9151835682.

The spelling of 71947271 in words is "seventy-one million, nine hundred forty-seven thousand, two hundred seventy-one".