71396681 has 2 divisors, whose sum is σ = 71396682. Its totient is φ = 71396680.

The previous prime is 71396629. The next prime is 71396687. The reversal of 71396681 is 18669317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57078025 + 14318656 = 7555^2 + 3784^2 .

It is an emirp because it is prime and its reverse (18669317) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71396681 is a prime.

It is a super-2 number, since 2×71396681² = 10194972115631522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (71396687) 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, 35698340 + 35698341.

It is an arithmetic number, because the mean of its divisors is an integer number (35698341).

Almost surely, 2^71396681 is an apocalyptic number.

It is an amenable number.

71396681 is a deficient number, since it is larger than the sum of its proper divisors (1).

71396681 is an equidigital number, since it uses as much as digits as its factorization.

71396681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 71396681 is about 8449.6556734579. The cubic root of 71396681 is about 414.8515092692.

The spelling of 71396681 in words is "seventy-one million, three hundred ninety-six thousand, six hundred eighty-one".