71389543 has 2 divisors, whose sum is σ = 71389544. Its totient is φ = 71389542.

The previous prime is 71389541. The next prime is 71389553. The reversal of 71389543 is 34598317.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71389543 - 2¹ = 71389541 is a prime.

Together with 71389541, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 71389496 and 71389505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71389541) 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, 35694771 + 35694772.

It is an arithmetic number, because the mean of its divisors is an integer number (35694772).

Almost surely, 2^71389543 is an apocalyptic number.

71389543 is a deficient number, since it is larger than the sum of its proper divisors (1).

71389543 is an equidigital number, since it uses as much as digits as its factorization.

71389543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 71389543 is about 8449.2332788248. The cubic root of 71389543 is about 414.8376836556.

The spelling of 71389543 in words is "seventy-one million, three hundred eighty-nine thousand, five hundred forty-three".