331222981 has 2 divisors, whose sum is σ = 331222982. Its totient is φ = 331222980.

The previous prime is 331222979. The next prime is 331223017. The reversal of 331222981 is 189222133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 317160481 + 14062500 = 17809^2 + 3750^2 .

It is an emirp because it is prime and its reverse (189222133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331222981 - 2¹ = 331222979 is a prime.

It is a super-2 number, since 2×331222981² = 219417326285052722, which contains 22 as substring.

Together with 331222979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331222901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165611490 + 165611491.

It is an arithmetic number, because the mean of its divisors is an integer number (165611491).

Almost surely, 2^331222981 is an apocalyptic number.

It is an amenable number.

331222981 is a deficient number, since it is larger than the sum of its proper divisors (1).

331222981 is an equidigital number, since it uses as much as digits as its factorization.

331222981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 331222981 is about 18199.5324390491. The cubic root of 331222981 is about 691.8949389156.

The spelling of 331222981 in words is "three hundred thirty-one million, two hundred twenty-two thousand, nine hundred eighty-one".