10000109981 has 2 divisors, whose sum is σ = 10000109982. Its totient is φ = 10000109980.

The previous prime is 10000109941. The next prime is 10000110007. The reversal of 10000109981 is 18990100001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8256629956 + 1743480025 = 90866^2 + 41755^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000109981 - 2¹⁰ = 10000108957 is a prime.

It is a super-2 number, since 2×10000109981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10000109941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000054990 + 5000054991.

It is an arithmetic number, because the mean of its divisors is an integer number (5000054991).

Almost surely, 2^10000109981 is an apocalyptic number.

It is an amenable number.

10000109981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10000109981 is an equidigital number, since it uses as much as digits as its factorization.

10000109981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 29.

Adding to 10000109981 its reverse (18990100001), we get a palindrome (28990209982).

The spelling of 10000109981 in words is "ten billion, one hundred nine thousand, nine hundred eighty-one".