71385871 has 4 divisors (see below), whose sum is σ = 71404992. Its totient is φ = 71366752.

The previous prime is 71385823. The next prime is 71385883. The reversal of 71385871 is 17858317.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71385871 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 (71385571) 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, 1930 + ... + 12103.

It is an arithmetic number, because the mean of its divisors is an integer number (17851248).

Almost surely, 2^71385871 is an apocalyptic number.

71385871 is a deficient number, since it is larger than the sum of its proper divisors (19121).

71385871 is a wasteful number, since it uses less digits than its factorization.

71385871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19120.

The product of its digits is 47040, while the sum is 40.

The square root of 71385871 is about 8449.0159782072. The cubic root of 71385871 is about 414.8305709888.

The spelling of 71385871 in words is "seventy-one million, three hundred eighty-five thousand, eight hundred seventy-one".