100001001091 has 2 divisors, whose sum is σ = 100001001092. Its totient is φ = 100001001090.

The previous prime is 100001001019. The next prime is 100001001101. The reversal of 100001001091 is 190100100001.

Together with previous prime (100001001019) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100001001091 - 2⁹ = 100001000579 is a prime.

It is not a weakly prime, because it can be changed into another prime (100001001011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000500545 + 50000500546.

It is an arithmetic number, because the mean of its divisors is an integer number (50000500546).

Almost surely, 2^100001001091 is an apocalyptic number.

100001001091 is a deficient number, since it is larger than the sum of its proper divisors (1).

100001001091 is an equidigital number, since it uses as much as digits as its factorization.

100001001091 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 13.

Adding to 100001001091 its reverse (190100100001), we get a palindrome (290101101092).

The spelling of 100001001091 in words is "one hundred billion, one million, one thousand, ninety-one".