71356081 has 2 divisors, whose sum is σ = 71356082. Its totient is φ = 71356080.

The previous prime is 71356069. The next prime is 71356133. The reversal of 71356081 is 18065317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62410000 + 8946081 = 7900^2 + 2991^2 .

It is a cyclic number.

It is not a de Polignac number, because 71356081 - 2¹³ = 71347889 is a prime.

It is a super-2 number, since 2×71356081² = 10183380591357122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71356781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35678040 + 35678041.

It is an arithmetic number, because the mean of its divisors is an integer number (35678041).

Almost surely, 2^71356081 is an apocalyptic number.

It is an amenable number.

71356081 is a deficient number, since it is larger than the sum of its proper divisors (1).

71356081 is an equidigital number, since it uses as much as digits as its factorization.

71356081 is an odious number, because the sum of its binary digits is odd.

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

The square root of 71356081 is about 8447.2528670568. The cubic root of 71356081 is about 414.7728587182.

The spelling of 71356081 in words is "seventy-one million, three hundred fifty-six thousand, eighty-one".