71040061 has 2 divisors, whose sum is σ = 71040062. Its totient is φ = 71040060.

The previous prime is 71040043. The next prime is 71040091. The reversal of 71040061 is 16004017.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45091225 + 25948836 = 6715^2 + 5094^2 .

It is a cyclic number.

It is not a de Polignac number, because 71040061 - 2⁵ = 71040029 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71040001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35520030 + 35520031.

It is an arithmetic number, because the mean of its divisors is an integer number (35520031).

Almost surely, 2^71040061 is an apocalyptic number.

It is an amenable number.

71040061 is a deficient number, since it is larger than the sum of its proper divisors (1).

71040061 is an equidigital number, since it uses as much as digits as its factorization.

71040061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 71040061 is about 8428.5266209463. The cubic root of 71040061 is about 414.1596407216.

Adding to 71040061 its reverse (16004017), we get a palindrome (87044078).

The spelling of 71040061 in words is "seventy-one million, forty thousand, sixty-one".