71005271 has 4 divisors (see below), whose sum is σ = 71193000. Its totient is φ = 70817544.

The previous prime is 71005267. The next prime is 71005289. The reversal of 71005271 is 17250017.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17250017 = 3391 ⋅5087.

It is a cyclic number.

It is not a de Polignac number, because 71005271 - 2² = 71005267 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 (71005201) 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, 93296 + ... + 94053.

It is an arithmetic number, because the mean of its divisors is an integer number (17798250).

Almost surely, 2^71005271 is an apocalyptic number.

71005271 is a deficient number, since it is larger than the sum of its proper divisors (187729).

71005271 is a wasteful number, since it uses less digits than its factorization.

71005271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187728.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 71005271 is about 8426.4625436775. The cubic root of 71005271 is about 414.0920217546.

Adding to 71005271 its reverse (17250017), we get a palindrome (88255288).

The spelling of 71005271 in words is "seventy-one million, five thousand, two hundred seventy-one".