100000019091 has 32 divisors (see below), whose sum is σ = 159028346880. Its totient is φ = 54650797344.

The previous prime is 100000019059. The next prime is 100000019111. The reversal of 100000019091 is 190910000001.

It is not a de Polignac number, because 100000019091 - 2⁵ = 100000019059 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (100000019011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6823750 + ... + 6838388.

It is an arithmetic number, because the mean of its divisors is an integer number (4969635840).

Almost surely, 2^100000019091 is an apocalyptic number.

100000019091 is a deficient number, since it is larger than the sum of its proper divisors (59028327789).

100000019091 is a wasteful number, since it uses less digits than its factorization.

100000019091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28815.

The product of its (nonzero) digits is 81, while the sum is 21.

Adding to 100000019091 its reverse (190910000001), we get a palindrome (290910019092).

The spelling of 100000019091 in words is "one hundred billion, nineteen thousand, ninety-one".