71112161 has 2 divisors, whose sum is σ = 71112162. Its totient is φ = 71112160.

The previous prime is 71112131. The next prime is 71112199. The reversal of 71112161 is 16121117.

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., 54302161 + 16810000 = 7369^2 + 4100^2 .

It is a cyclic number.

It is not a de Polignac number, because 71112161 - 2¹⁰ = 71111137 is a prime.

It is not a weakly prime, because it can be changed into another prime (71112101) 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, 35556080 + 35556081.

It is an arithmetic number, because the mean of its divisors is an integer number (35556081).

Almost surely, 2^71112161 is an apocalyptic number.

It is an amenable number.

71112161 is a deficient number, since it is larger than the sum of its proper divisors (1).

71112161 is an equidigital number, since it uses as much as digits as its factorization.

71112161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84, while the sum is 20.

The square root of 71112161 is about 8432.8026776393. The cubic root of 71112161 is about 414.2997063560.

Adding to 71112161 its reverse (16121117), we get a palindrome (87233278).

The spelling of 71112161 in words is "seventy-one million, one hundred twelve thousand, one hundred sixty-one".