305303981 has 2 divisors, whose sum is σ = 305303982. Its totient is φ = 305303980.

The previous prime is 305303959. The next prime is 305304007. The reversal of 305303981 is 189303503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 294637225 + 10666756 = 17165^2 + 3266^2 .

It is a cyclic number.

It is not a de Polignac number, because 305303981 - 2¹⁰ = 305302957 is a prime.

It is a super-2 number, since 2×305303981² = 186421041628896722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305303941) 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, 152651990 + 152651991.

It is an arithmetic number, because the mean of its divisors is an integer number (152651991).

Almost surely, 2^305303981 is an apocalyptic number.

It is an amenable number.

305303981 is a deficient number, since it is larger than the sum of its proper divisors (1).

305303981 is an equidigital number, since it uses as much as digits as its factorization.

305303981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 305303981 is about 17472.9499798975. The cubic root of 305303981 is about 673.3551030169.

The spelling of 305303981 in words is "three hundred five million, three hundred three thousand, nine hundred eighty-one".