304128109 has 2 divisors, whose sum is σ = 304128110. Its totient is φ = 304128108.

The previous prime is 304128101. The next prime is 304128137. The reversal of 304128109 is 901821403.

It is a happy number.

It is an a-pointer prime, because the next prime (304128137) can be obtained adding 304128109 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160655625 + 143472484 = 12675^2 + 11978^2 .

It is a cyclic number.

It is not a de Polignac number, because 304128109 - 2³ = 304128101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304128101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152064054 + 152064055.

It is an arithmetic number, because the mean of its divisors is an integer number (152064055).

Almost surely, 2^304128109 is an apocalyptic number.

It is an amenable number.

304128109 is a deficient number, since it is larger than the sum of its proper divisors (1).

304128109 is an equidigital number, since it uses as much as digits as its factorization.

304128109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 304128109 is about 17439.2691647328. The cubic root of 304128109 is about 672.4895196977.

The spelling of 304128109 in words is "three hundred four million, one hundred twenty-eight thousand, one hundred nine".