71408081 has 2 divisors, whose sum is σ = 71408082. Its totient is φ = 71408080.

The previous prime is 71408047. The next prime is 71408083. The reversal of 71408081 is 18080417.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52780225 + 18627856 = 7265^2 + 4316^2 .

It is an emirp because it is prime and its reverse (18080417) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71408081 - 2²² = 67213777 is a prime.

It is a super-2 number, since 2×71408081² = 10198228064205122, which contains 22 as substring.

Together with 71408083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71408083) 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, 35704040 + 35704041.

It is an arithmetic number, because the mean of its divisors is an integer number (35704041).

Almost surely, 2^71408081 is an apocalyptic number.

It is an amenable number.

71408081 is a deficient number, since it is larger than the sum of its proper divisors (1).

71408081 is an equidigital number, since it uses as much as digits as its factorization.

71408081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 71408081 is about 8450.3302302336. The cubic root of 71408081 is about 414.8735880523.

Adding to 71408081 its reverse (18080417), we get a palindrome (89488498).

The spelling of 71408081 in words is "seventy-one million, four hundred eight thousand, eighty-one".