71040047 has 4 divisors (see below), whose sum is σ = 76504680. Its totient is φ = 65575416.

The previous prime is 71040043. The next prime is 71040061. The reversal of 71040047 is 74004017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74004017 = 139 ⋅532403.

It is a cyclic number.

It is not a de Polignac number, because 71040047 - 2² = 71040043 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 (71040043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2732297 + ... + 2732322.

It is an arithmetic number, because the mean of its divisors is an integer number (19126170).

Almost surely, 2^71040047 is an apocalyptic number.

71040047 is a deficient number, since it is larger than the sum of its proper divisors (5464633).

71040047 is a wasteful number, since it uses less digits than its factorization.

71040047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5464632.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 71040047 is about 8428.5257904333. The cubic root of 71040047 is about 414.1596135152.

The spelling of 71040047 in words is "seventy-one million, forty thousand, forty-seven".