71765081 has 2 divisors, whose sum is σ = 71765082. Its totient is φ = 71765080.

The previous prime is 71765039. The next prime is 71765087. The reversal of 71765081 is 18056717.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 7203856 = 8035^2 + 2684^2 .

It is a cyclic number.

It is not a de Polignac number, because 71765081 - 2¹⁰ = 71764057 is a prime.

It is a super-2 number, since 2×71765081² = 10300453701873122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71765087) 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, 35882540 + 35882541.

It is an arithmetic number, because the mean of its divisors is an integer number (35882541).

Almost surely, 2^71765081 is an apocalyptic number.

It is an amenable number.

71765081 is a deficient number, since it is larger than the sum of its proper divisors (1).

71765081 is an equidigital number, since it uses as much as digits as its factorization.

71765081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 71765081 is about 8471.4273295591. The cubic root of 71765081 is about 415.5638168065.

The spelling of 71765081 in words is "seventy-one million, seven hundred sixty-five thousand, eighty-one".