71384981 has 2 divisors, whose sum is σ = 71384982. Its totient is φ = 71384980.

The previous prime is 71384969. The next prime is 71384983. The reversal of 71384981 is 18948317.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39564100 + 31820881 = 6290^2 + 5641^2 .

It is an emirp because it is prime and its reverse (18948317) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71384981 - 2¹⁰ = 71383957 is a prime.

It is a super-2 number, since 2×71384981² = 10191631024740722, which contains 22 as substring.

Together with 71384983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71384983) 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, 35692490 + 35692491.

It is an arithmetic number, because the mean of its divisors is an integer number (35692491).

Almost surely, 2^71384981 is an apocalyptic number.

It is an amenable number.

71384981 is a deficient number, since it is larger than the sum of its proper divisors (1).

71384981 is an equidigital number, since it uses as much as digits as its factorization.

71384981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 71384981 is about 8448.9633091877. The cubic root of 71384981 is about 414.8288470214.

The spelling of 71384981 in words is "seventy-one million, three hundred eighty-four thousand, nine hundred eighty-one".