71047913 has 4 divisors (see below), whose sum is σ = 75227220. Its totient is φ = 66868608.

The previous prime is 71047909. The next prime is 71047919. The reversal of 71047913 is 31974017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31974017 = 19 ⋅1682843.

It can be written as a sum of positive squares in 2 ways, for example, as 64432729 + 6615184 = 8027^2 + 2572^2 .

It is a cyclic number.

It is not a de Polignac number, because 71047913 - 2² = 71047909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71047913.

It is not an unprimeable number, because it can be changed into a prime (71047919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2089628 + ... + 2089661.

It is an arithmetic number, because the mean of its divisors is an integer number (18806805).

Almost surely, 2^71047913 is an apocalyptic number.

It is an amenable number.

71047913 is a deficient number, since it is larger than the sum of its proper divisors (4179307).

71047913 is a wasteful number, since it uses less digits than its factorization.

71047913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4179306.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 71047913 is about 8428.9924071623. The cubic root of 71047913 is about 414.1748990686.

The spelling of 71047913 in words is "seventy-one million, forty-seven thousand, nine hundred thirteen".