10919100091981 has 2 divisors, whose sum is σ = 10919100091982. Its totient is φ = 10919100091980.

The previous prime is 10919100091979. The next prime is 10919100092057. The reversal of 10919100091981 is 18919000191901.

10919100091981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10340945158756 + 578154933225 = 3215734^2 + 760365^2 .

It is a cyclic number.

It is not a de Polignac number, because 10919100091981 - 2¹ = 10919100091979 is a prime.

It is a super-2 number, since 2×10919100091981² (a number of 27 digits) contains 22 as substring.

Together with 10919100091979, 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 (10919100091931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5459550045990 + 5459550045991.

It is an arithmetic number, because the mean of its divisors is an integer number (5459550045991).

Almost surely, 2^{10919100091981} is an apocalyptic number.

It is an amenable number.

10919100091981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10919100091981 is an equidigital number, since it uses as much as digits as its factorization.

10919100091981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 49.

The spelling of 10919100091981 in words is "ten trillion, nine hundred nineteen billion, one hundred million, ninety-one thousand, nine hundred eighty-one".