1000000000091 has 2 divisors, whose sum is σ = 1000000000092. Its totient is φ = 1000000000090.

The previous prime is 1000000000063. The next prime is 1000000000121. The reversal of 1000000000091 is 1900000000001.

It is a weak prime.

It is an emirp because it is prime and its reverse (1900000000001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000000000091 - 2³⁴ = 982820130907 is a prime.

1000000000091 is a modest number, since divided by 91 gives 1 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 999999999991 and 1000000000081.

It is not a weakly prime, because it can be changed into another prime (1000000000061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500000000045 + 500000000046.

It is an arithmetic number, because the mean of its divisors is an integer number (500000000046).

Almost surely, 2^{1000000000091} is an apocalyptic number.

1000000000091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000000000091 is an equidigital number, since it uses as much as digits as its factorization.

1000000000091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9, while the sum is 11.

Adding to 1000000000091 its reverse (1900000000001), we get a palindrome (2900000000092).

The spelling of 1000000000091 in words is "one trillion, ninety-one", and thus it is an aban number and an uban number.