73065581 has 2 divisors, whose sum is σ = 73065582. Its totient is φ = 73065580.

The previous prime is 73065569. The next prime is 73065611. The reversal of 73065581 is 18556037.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47472100 + 25593481 = 6890^2 + 5059^2 .

It is an emirp because it is prime and its reverse (18556037) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73065581 is a prime.

It is a super-2 number, since 2×73065581² = 10677158253735122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73085581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36532790 + 36532791.

It is an arithmetic number, because the mean of its divisors is an integer number (36532791).

Almost surely, 2^73065581 is an apocalyptic number.

It is an amenable number.

73065581 is a deficient number, since it is larger than the sum of its proper divisors (1).

73065581 is an equidigital number, since it uses as much as digits as its factorization.

73065581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 73065581 is about 8547.8407214922. The cubic root of 73065581 is about 418.0590352583.

The spelling of 73065581 in words is "seventy-three million, sixty-five thousand, five hundred eighty-one".