71808983 has 2 divisors, whose sum is σ = 71808984. Its totient is φ = 71808982.

The previous prime is 71808977. The next prime is 71809021. The reversal of 71808983 is 38980817.

It is a weak prime.

It is an emirp because it is prime and its reverse (38980817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71808983 - 2²⁰ = 70760407 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71808943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35904491 + 35904492.

It is an arithmetic number, because the mean of its divisors is an integer number (35904492).

Almost surely, 2^71808983 is an apocalyptic number.

71808983 is a deficient number, since it is larger than the sum of its proper divisors (1).

71808983 is an equidigital number, since it uses as much as digits as its factorization.

71808983 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 71808983 is about 8474.0181142124. The cubic root of 71808983 is about 415.6485393644.

The spelling of 71808983 in words is "seventy-one million, eight hundred eight thousand, nine hundred eighty-three".