304040081 has 2 divisors, whose sum is σ = 304040082. Its totient is φ = 304040080.

The previous prime is 304040027. The next prime is 304040083. The reversal of 304040081 is 180040403.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230766481 + 73273600 = 15191^2 + 8560^2 .

It is an emirp because it is prime and its reverse (180040403) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 304040081 - 2⁶ = 304040017 is a prime.

It is a super-2 number, since 2×304040081² = 184880741708973122, which contains 22 as substring.

Together with 304040083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (304040083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152020040 + 152020041.

It is an arithmetic number, because the mean of its divisors is an integer number (152020041).

Almost surely, 2^304040081 is an apocalyptic number.

It is an amenable number.

304040081 is a deficient number, since it is larger than the sum of its proper divisors (1).

304040081 is an equidigital number, since it uses as much as digits as its factorization.

304040081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 304040081 is about 17436.7451377830. The cubic root of 304040081 is about 672.4246307928.

Adding to 304040081 its reverse (180040403), we get a palindrome (484080484).

The spelling of 304040081 in words is "three hundred four million, forty thousand, eighty-one".