1331121230981 has 2 divisors, whose sum is σ = 1331121230982. Its totient is φ = 1331121230980.

The previous prime is 1331121230963. The next prime is 1331121231007. The reversal of 1331121230981 is 1890321211331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 701851870756 + 629269360225 = 837766^2 + 793265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331121230981 - 2⁶ = 1331121230917 is a prime.

It is a super-2 number, since 2×1331121230981² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331121230281) 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, 665560615490 + 665560615491.

It is an arithmetic number, because the mean of its divisors is an integer number (665560615491).

Almost surely, 2^{1331121230981} is an apocalyptic number.

It is an amenable number.

1331121230981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331121230981 is an equidigital number, since it uses as much as digits as its factorization.

1331121230981 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 1331121230981 in words is "one trillion, three hundred thirty-one billion, one hundred twenty-one million, two hundred thirty thousand, nine hundred eighty-one".