304311131981 has 2 divisors, whose sum is σ = 304311131982. Its totient is φ = 304311131980.

The previous prime is 304311131977. The next prime is 304311132007. The reversal of 304311131981 is 189131113403.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235354997956 + 68956134025 = 485134^2 + 262595^2 .

It is a cyclic number.

It is not a de Polignac number, because 304311131981 - 2² = 304311131977 is a prime.

It is a super-2 number, since 2×304311131981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (304311131921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152155565990 + 152155565991.

It is an arithmetic number, because the mean of its divisors is an integer number (152155565991).

Almost surely, 2^304311131981 is an apocalyptic number.

It is an amenable number.

304311131981 is a deficient number, since it is larger than the sum of its proper divisors (1).

304311131981 is an equidigital number, since it uses as much as digits as its factorization.

304311131981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 304311131981 in words is "three hundred four billion, three hundred eleven million, one hundred thirty-one thousand, nine hundred eighty-one".