71343521 has 2 divisors, whose sum is σ = 71343522. Its totient is φ = 71343520.

The previous prime is 71343497. The next prime is 71343523. The reversal of 71343521 is 12534317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67486225 + 3857296 = 8215^2 + 1964^2 .

It is a cyclic number.

It is not a de Polignac number, because 71343521 - 2¹⁸ = 71081377 is a prime.

Together with 71343523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71343523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35671760 + 35671761.

It is an arithmetic number, because the mean of its divisors is an integer number (35671761).

Almost surely, 2^71343521 is an apocalyptic number.

It is an amenable number.

71343521 is a deficient number, since it is larger than the sum of its proper divisors (1).

71343521 is an equidigital number, since it uses as much as digits as its factorization.

71343521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 26.

The square root of 71343521 is about 8446.5093973783. The cubic root of 71343521 is about 414.7485213727.

Adding to 71343521 its reverse (12534317), we get a palindrome (83877838).

The spelling of 71343521 in words is "seventy-one million, three hundred forty-three thousand, five hundred twenty-one".