71043865 has 4 divisors (see below), whose sum is σ = 85252644. Its totient is φ = 56835088.

The previous prime is 71043859. The next prime is 71043871. The reversal of 71043865 is 56834017.

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

It is an interprime number because it is at equal distance from previous prime (71043859) and next prime (71043871).

It can be written as a sum of positive squares in 2 ways, for example, as 23309584 + 47734281 = 4828^2 + 6909^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71043865 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71043865.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7104382 + ... + 7104391.

It is an arithmetic number, because the mean of its divisors is an integer number (21313161).

Almost surely, 2^71043865 is an apocalyptic number.

It is an amenable number.

71043865 is a deficient number, since it is larger than the sum of its proper divisors (14208779).

71043865 is a wasteful number, since it uses less digits than its factorization.

71043865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14208778.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 71043865 is about 8428.7522801421. The cubic root of 71043865 is about 414.1670329598.

The spelling of 71043865 in words is "seventy-one million, forty-three thousand, eight hundred sixty-five".