71330081 has 2 divisors, whose sum is σ = 71330082. Its totient is φ = 71330080.

The previous prime is 71330059. The next prime is 71330131. The reversal of 71330081 is 18003317.

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., 46240000 + 25090081 = 6800^2 + 5009^2 .

It is a cyclic number.

It is not a de Polignac number, because 71330081 - 2¹⁸ = 71067937 is a prime.

It is a super-2 number, since 2×71330081² = 10175960910933122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71330041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35665040 + 35665041.

It is an arithmetic number, because the mean of its divisors is an integer number (35665041).

Almost surely, 2^71330081 is an apocalyptic number.

It is an amenable number.

71330081 is a deficient number, since it is larger than the sum of its proper divisors (1).

71330081 is an equidigital number, since it uses as much as digits as its factorization.

71330081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 71330081 is about 8445.7137649816. The cubic root of 71330081 is about 414.7224756990.

Adding to 71330081 its reverse (18003317), we get a palindrome (89333398).

The spelling of 71330081 in words is "seventy-one million, three hundred thirty thousand, eighty-one".