71871871 has 4 divisors (see below), whose sum is σ = 73814392. Its totient is φ = 69929352.

The previous prime is 71871829. The next prime is 71871881. The reversal of 71871871 is 17817817.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17817817 = 191 ⋅93287.

It is a cyclic number.

It is not a de Polignac number, because 71871871 - 2¹¹ = 71869823 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 (71871881) 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, 971205 + ... + 971278.

It is an arithmetic number, because the mean of its divisors is an integer number (18453598).

Almost surely, 2^71871871 is an apocalyptic number.

71871871 is a deficient number, since it is larger than the sum of its proper divisors (1942521).

71871871 is a wasteful number, since it uses less digits than its factorization.

71871871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942520.

The product of its digits is 21952, while the sum is 40.

The square root of 71871871 is about 8477.7279385458. The cubic root of 71871871 is about 415.7698411724.

The spelling of 71871871 in words is "seventy-one million, eight hundred seventy-one thousand, eight hundred seventy-one".