9973811533381 has 2 divisors, whose sum is σ = 9973811533382. Its totient is φ = 9973811533380.

The previous prime is 9973811533379. The next prime is 9973811533421. The reversal of 9973811533381 is 1833351183799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7742250600100 + 2231560933281 = 2782490^2 + 1493841^2 .

It is a cyclic number.

It is not a de Polignac number, because 9973811533381 - 2¹ = 9973811533379 is a prime.

It is a super-2 number, since 2×9973811533381² (a number of 27 digits) contains 22 as substring.

Together with 9973811533379, 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 (9973811533781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4986905766690 + 4986905766691.

It is an arithmetic number, because the mean of its divisors is an integer number (4986905766691).

Almost surely, 2^{9973811533381} is an apocalyptic number.

It is an amenable number.

9973811533381 is a deficient number, since it is larger than the sum of its proper divisors (1).

9973811533381 is an equidigital number, since it uses as much as digits as its factorization.

9973811533381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14696640, while the sum is 61.

The spelling of 9973811533381 in words is "nine trillion, nine hundred seventy-three billion, eight hundred eleven million, five hundred thirty-three thousand, three hundred eighty-one".