71047831 has 2 divisors, whose sum is σ = 71047832. Its totient is φ = 71047830.

The previous prime is 71047771. The next prime is 71047841. The reversal of 71047831 is 13874017.

It is a strong prime.

It is an emirp because it is prime and its reverse (13874017) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71047831 - 2¹¹ = 71045783 is a prime.

It is a super-2 number, since 2×71047831² = 10095588579609122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 71047793 and 71047802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71047841) 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 as a sum of consecutive naturals, namely, 35523915 + 35523916.

It is an arithmetic number, because the mean of its divisors is an integer number (35523916).

Almost surely, 2^71047831 is an apocalyptic number.

71047831 is a deficient number, since it is larger than the sum of its proper divisors (1).

71047831 is an equidigital number, since it uses as much as digits as its factorization.

71047831 is an odious number, because the sum of its binary digits is odd.

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

The square root of 71047831 is about 8428.9875429971. The cubic root of 71047831 is about 414.1747397284.

The spelling of 71047831 in words is "seventy-one million, forty-seven thousand, eight hundred thirty-one".