31101021329981 has 2 divisors, whose sum is σ = 31101021329982. Its totient is φ = 31101021329980.

The previous prime is 31101021329941. The next prime is 31101021329999. The reversal of 31101021329981 is 18992312010113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26728217564356 + 4372803765625 = 5169934^2 + 2091125^2 .

It is a cyclic number.

It is not a de Polignac number, because 31101021329981 - 2¹⁴ = 31101021313597 is a prime.

It is a super-2 number, since 2×31101021329981² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31101021329941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15550510664990 + 15550510664991.

It is an arithmetic number, because the mean of its divisors is an integer number (15550510664991).

Almost surely, 2^{31101021329981} is an apocalyptic number.

It is an amenable number.

31101021329981 is a deficient number, since it is larger than the sum of its proper divisors (1).

31101021329981 is an equidigital number, since it uses as much as digits as its factorization.

31101021329981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 31101021329981 in words is "thirty-one trillion, one hundred one billion, twenty-one million, three hundred twenty-nine thousand, nine hundred eighty-one".