71030881 has 2 divisors, whose sum is σ = 71030882. Its totient is φ = 71030880.

The previous prime is 71030863. The next prime is 71030887. The reversal of 71030881 is 18803017.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48790225 + 22240656 = 6985^2 + 4716^2 .

It is a cyclic number.

It is not a de Polignac number, because 71030881 - 2⁷ = 71030753 is a prime.

It is a super-2 number, since 2×71030881² = 10090772111272322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71030887) 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, 35515440 + 35515441.

It is an arithmetic number, because the mean of its divisors is an integer number (35515441).

Almost surely, 2^71030881 is an apocalyptic number.

It is an amenable number.

71030881 is a deficient number, since it is larger than the sum of its proper divisors (1).

71030881 is an equidigital number, since it uses as much as digits as its factorization.

71030881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 71030881 is about 8427.9820241859. The cubic root of 71030881 is about 414.1418003218.

Adding to 71030881 its reverse (18803017), we get a palindrome (89833898).

The spelling of 71030881 in words is "seventy-one million, thirty thousand, eight hundred eighty-one".