71808941 has 2 divisors, whose sum is σ = 71808942. Its totient is φ = 71808940.

The previous prime is 71808937. The next prime is 71808943. The reversal of 71808941 is 14980817.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64464841 + 7344100 = 8029^2 + 2710^2 .

It is a cyclic number.

It is not a de Polignac number, because 71808941 - 2² = 71808937 is a prime.

It is a Sophie Germain prime.

Together with 71808943, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 71808895 and 71808904.

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 polite number, since it can be written as a sum of consecutive naturals, namely, 35904470 + 35904471.

It is an arithmetic number, because the mean of its divisors is an integer number (35904471).

Almost surely, 2^71808941 is an apocalyptic number.

It is an amenable number.

71808941 is a deficient number, since it is larger than the sum of its proper divisors (1).

71808941 is an equidigital number, since it uses as much as digits as its factorization.

71808941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 71808941 is about 8474.0156360488. The cubic root of 71808941 is about 415.6484583289.

The spelling of 71808941 in words is "seventy-one million, eight hundred eight thousand, nine hundred forty-one".