71416561 has 2 divisors, whose sum is σ = 71416562. Its totient is φ = 71416560.

The previous prime is 71416517. The next prime is 71416567. The reversal of 71416561 is 16561417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59582961 + 11833600 = 7719^2 + 3440^2 .

It is a cyclic number.

It is not a de Polignac number, because 71416561 - 2⁹ = 71416049 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71416567) 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 as a sum of consecutive naturals, namely, 35708280 + 35708281.

It is an arithmetic number, because the mean of its divisors is an integer number (35708281).

Almost surely, 2^71416561 is an apocalyptic number.

It is an amenable number.

71416561 is a deficient number, since it is larger than the sum of its proper divisors (1).

71416561 is an equidigital number, since it uses as much as digits as its factorization.

71416561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 71416561 is about 8450.8319708772. The cubic root of 71416561 is about 414.8900100442.

Adding to 71416561 its reverse (16561417), we get a palindrome (87977978).

The spelling of 71416561 in words is "seventy-one million, four hundred sixteen thousand, five hundred sixty-one".