71171971 has 4 divisors (see below), whose sum is σ = 76646752. Its totient is φ = 65697192.

The previous prime is 71171927. The next prime is 71171981. The reversal of 71171971 is 17917117.

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

It is a cyclic number.

It is not a de Polignac number, because 71171971 - 2⁹ = 71171459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71171981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2737371 + ... + 2737396.

It is an arithmetic number, because the mean of its divisors is an integer number (19161688).

Almost surely, 2^71171971 is an apocalyptic number.

71171971 is a deficient number, since it is larger than the sum of its proper divisors (5474781).

71171971 is a wasteful number, since it uses less digits than its factorization.

71171971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5474780.

The product of its digits is 3087, while the sum is 34.

The square root of 71171971 is about 8436.3482028660. The cubic root of 71171971 is about 414.4158248995.

The spelling of 71171971 in words is "seventy-one million, one hundred seventy-one thousand, nine hundred seventy-one".