71543369 has 2 divisors, whose sum is σ = 71543370. Its totient is φ = 71543368.

The previous prime is 71543323. The next prime is 71543371. The reversal of 71543369 is 96334517.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54937744 + 16605625 = 7412^2 + 4075^2 .

It is an emirp because it is prime and its reverse (96334517) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71543369 is a prime.

It is a super-2 number, since 2×71543369² = 10236907295740322, which contains 22 as substring.

Together with 71543371, 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 (71543399) 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, 35771684 + 35771685.

It is an arithmetic number, because the mean of its divisors is an integer number (35771685).

Almost surely, 2^71543369 is an apocalyptic number.

It is an amenable number.

71543369 is a deficient number, since it is larger than the sum of its proper divisors (1).

71543369 is an equidigital number, since it uses as much as digits as its factorization.

71543369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 38.

The square root of 71543369 is about 8458.3313366172. The cubic root of 71543369 is about 415.1354258751.

The spelling of 71543369 in words is "seventy-one million, five hundred forty-three thousand, three hundred sixty-nine".