100191001 has 4 divisors (see below), whose sum is σ = 100640512. Its totient is φ = 99741492.

The previous prime is 100190999. The next prime is 100191017.

100191001 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 100191001 - 2¹ = 100190999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100111001) 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, 224421 + ... + 224866.

It is an arithmetic number, because the mean of its divisors is an integer number (25160128).

Almost surely, 2^100191001 is an apocalyptic number.

It is an amenable number.

100191001 is a deficient number, since it is larger than the sum of its proper divisors (449511).

100191001 is an equidigital number, since it uses as much as digits as its factorization.

100191001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449510.

The product of its (nonzero) digits is 9, while the sum is 13.

The square root of 100191001 is about 10009.5454941770. The cubic root of 100191001 is about 464.4542114507.

The spelling of 100191001 in words is "one hundred million, one hundred ninety-one thousand, one".