71047841 has 2 divisors, whose sum is σ = 71047842. Its totient is φ = 71047840.

The previous prime is 71047831. The next prime is 71047843. The reversal of 71047841 is 14874017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70492816 + 555025 = 8396^2 + 745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71047841 is a prime.

It is a super-2 number, since 2×71047841² = 10095591421522562, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 71047843, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 71047798 and 71047807.

It is not a weakly prime, because it can be changed into another 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 as a sum of consecutive naturals, namely, 35523920 + 35523921.

It is an arithmetic number, because the mean of its divisors is an integer number (35523921).

Almost surely, 2^71047841 is an apocalyptic number.

It is an amenable number.

71047841 is a deficient number, since it is larger than the sum of its proper divisors (1).

71047841 is an equidigital number, since it uses as much as digits as its factorization.

71047841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 71047841 is about 8428.9881361881. The cubic root of 71047841 is about 414.1747591601.

The spelling of 71047841 in words is "seventy-one million, forty-seven thousand, eight hundred forty-one".