10000109999981 has 2 divisors, whose sum is σ = 10000109999982. Its totient is φ = 10000109999980.

The previous prime is 10000109999959. The next prime is 10000110000017. The reversal of 10000109999981 is 18999990100001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9232543020100 + 767566979881 = 3038510^2 + 876109^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10000109999981 is a prime.

It is a super-2 number, since 2×10000109999981² (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 (10000109999281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000054999990 + 5000054999991.

It is an arithmetic number, because the mean of its divisors is an integer number (5000054999991).

Almost surely, 2^{10000109999981} is an apocalyptic number.

It is an amenable number.

10000109999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10000109999981 is an equidigital number, since it uses as much as digits as its factorization.

10000109999981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 56.

The spelling of 10000109999981 in words is "ten trillion, one hundred nine million, nine hundred ninety-nine thousand, nine hundred eighty-one".