13311322231981 has 2 divisors, whose sum is σ = 13311322231982. Its totient is φ = 13311322231980.

The previous prime is 13311322231969. The next prime is 13311322232071. The reversal of 13311322231981 is 18913222311331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10447666321225 + 2863655910756 = 3232285^2 + 1692234^2 .

It is a cyclic number.

It is not a de Polignac number, because 13311322231981 - 2³¹ = 13309174748333 is a prime.

It is a super-2 number, since 2×13311322231981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13311322201981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6655661115990 + 6655661115991.

It is an arithmetic number, because the mean of its divisors is an integer number (6655661115991).

Almost surely, 2^{13311322231981} is an apocalyptic number.

It is an amenable number.

13311322231981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13311322231981 is an equidigital number, since it uses as much as digits as its factorization.

13311322231981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The spelling of 13311322231981 in words is "thirteen trillion, three hundred eleven billion, three hundred twenty-two million, two hundred thirty-one thousand, nine hundred eighty-one".