71043569 has 2 divisors, whose sum is σ = 71043570. Its totient is φ = 71043568.

The previous prime is 71043551. The next prime is 71043571. The reversal of 71043569 is 96534017.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49773025 + 21270544 = 7055^2 + 4612^2 .

It is a cyclic number.

It is not a de Polignac number, because 71043569 - 2²⁴ = 54266353 is a prime.

It is a super-2 number, since 2×71043569² = 10094377392515522, which contains 22 as substring.

Together with 71043571, 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 (71043769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35521784 + 35521785.

It is an arithmetic number, because the mean of its divisors is an integer number (35521785).

Almost surely, 2^71043569 is an apocalyptic number.

It is an amenable number.

71043569 is a deficient number, since it is larger than the sum of its proper divisors (1).

71043569 is an equidigital number, since it uses as much as digits as its factorization.

71043569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 71043569 is about 8428.7347211785. The cubic root of 71043569 is about 414.1664577583.

The spelling of 71043569 in words is "seventy-one million, forty-three thousand, five hundred sixty-nine".