71000005 has 4 divisors (see below), whose sum is σ = 85200012. Its totient is φ = 56800000.

The previous prime is 70999997. The next prime is 71000051. The reversal of 71000005 is 50000017.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9941409 + 61058596 = 3153^2 + 7814^2 .

It is not a de Polignac number, because 71000005 - 2³ = 70999997 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7099996 + ... + 7100005.

It is an arithmetic number, because the mean of its divisors is an integer number (21300003).

Almost surely, 2^71000005 is an apocalyptic number.

It is an amenable number.

71000005 is a deficient number, since it is larger than the sum of its proper divisors (14200007).

71000005 is a wasteful number, since it uses less digits than its factorization.

71000005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14200006.

The product of its (nonzero) digits is 35, while the sum is 13.

The square root of 71000005 is about 8426.1500698718. The cubic root of 71000005 is about 414.0817846625.

The spelling of 71000005 in words is "seventy-one million, five", and thus it is an aban number and an uban number.