71965543 has 16 divisors (see below), whose sum is σ = 79425472. Its totient is φ = 64800000.

The previous prime is 71965513. The next prime is 71965609. The reversal of 71965543 is 34556917.

It is a cyclic number.

It is not a de Polignac number, because 71965543 - 2⁵ = 71965511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71965496 and 71965505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71965513) 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 15 ways as a sum of consecutive naturals, for example, 119443 + ... + 120043.

It is an arithmetic number, because the mean of its divisors is an integer number (4964092).

Almost surely, 2^71965543 is an apocalyptic number.

71965543 is a deficient number, since it is larger than the sum of its proper divisors (7459929).

71965543 is a wasteful number, since it uses less digits than its factorization.

71965543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826.

The product of its digits is 113400, while the sum is 40.

The square root of 71965543 is about 8483.2507330622. The cubic root of 71965543 is about 415.9503897169.

The spelling of 71965543 in words is "seventy-one million, nine hundred sixty-five thousand, five hundred forty-three".