71047813 has 8 divisors (see below), whose sum is σ = 71693568. Its totient is φ = 70405104.

The previous prime is 71047771. The next prime is 71047831. The reversal of 71047813 is 31874017.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71047813 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 (71047843) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 79656 + ... + 80542.

It is an arithmetic number, because the mean of its divisors is an integer number (8961696).

Almost surely, 2^71047813 is an apocalyptic number.

It is an amenable number.

71047813 is a deficient number, since it is larger than the sum of its proper divisors (645755).

71047813 is a wasteful number, since it uses less digits than its factorization.

71047813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 71047813 is about 8428.9864752531. The cubic root of 71047813 is about 414.1747047513.

The spelling of 71047813 in words is "seventy-one million, forty-seven thousand, eight hundred thirteen".