73805981 has 2 divisors, whose sum is σ = 73805982. Its totient is φ = 73805980.

The previous prime is 73805969. The next prime is 73805983. The reversal of 73805981 is 18950837.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 8357881 = 8090^2 + 2891^2 .

It is an emirp because it is prime and its reverse (18950837) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73805981 - 2⁶ = 73805917 is a prime.

It is a super-2 number, since 2×73805981² = 10894645662744722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 73805983, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73805983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36902990 + 36902991.

It is an arithmetic number, because the mean of its divisors is an integer number (36902991).

Almost surely, 2^73805981 is an apocalyptic number.

It is an amenable number.

73805981 is a deficient number, since it is larger than the sum of its proper divisors (1).

73805981 is an equidigital number, since it uses as much as digits as its factorization.

73805981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 73805981 is about 8591.0407402130. The cubic root of 73805981 is about 419.4664066561.

The spelling of 73805981 in words is "seventy-three million, eight hundred five thousand, nine hundred eighty-one".