305442121 has 2 divisors, whose sum is σ = 305442122. Its totient is φ = 305442120.

The previous prime is 305442113. The next prime is 305442131. The reversal of 305442121 is 121244503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 304014096 + 1428025 = 17436^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 305442121 - 2³ = 305442113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 305442092 and 305442101.

It is not a weakly prime, because it can be changed into another prime (305442131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152721060 + 152721061.

It is an arithmetic number, because the mean of its divisors is an integer number (152721061).

Almost surely, 2^305442121 is an apocalyptic number.

It is an amenable number.

305442121 is a deficient number, since it is larger than the sum of its proper divisors (1).

305442121 is an equidigital number, since it uses as much as digits as its factorization.

305442121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 305442121 is about 17476.9025001572. The cubic root of 305442121 is about 673.4566447089.

Adding to 305442121 its reverse (121244503), we get a palindrome (426686624).

The spelling of 305442121 in words is "three hundred five million, four hundred forty-two thousand, one hundred twenty-one".