100909191001 has 4 divisors (see below), whose sum is σ = 101908292004. Its totient is φ = 99910090000.

The previous prime is 100909190959. The next prime is 100909191011. The reversal of 100909191001 is 100191909001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73791006025 + 27118184976 = 271645^2 + 164676^2 .

It is a cyclic number.

It is not a de Polignac number, because 100909191001 - 2⁹ = 100909190489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100909191011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499550350 + ... + 499550551.

It is an arithmetic number, because the mean of its divisors is an integer number (25477073001).

Almost surely, 2^100909191001 is an apocalyptic number.

It is an amenable number.

100909191001 is a deficient number, since it is larger than the sum of its proper divisors (999101003).

100909191001 is an equidigital number, since it uses as much as digits as its factorization.

100909191001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999101002.

The product of its (nonzero) digits is 729, while the sum is 31.

The spelling of 100909191001 in words is "one hundred billion, nine hundred nine million, one hundred ninety-one thousand, one".