10000191 has 4 divisors (see below), whose sum is σ = 13333592. Its totient is φ = 6666792.

The previous prime is 10000189. The next prime is 10000223. The reversal of 10000191 is 19100001.

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

It is not a de Polignac number, because 10000191 - 2¹ = 10000189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000121) 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, 1666696 + ... + 1666701.

It is an arithmetic number, because the mean of its divisors is an integer number (3333398).

Almost surely, 2^10000191 is an apocalyptic number.

10000191 is a deficient number, since it is larger than the sum of its proper divisors (3333401).

10000191 is an equidigital number, since it uses as much as digits as its factorization.

10000191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3333400.

The product of its (nonzero) digits is 9, while the sum is 12.

The square root of 10000191 is about 3162.3078597758. The cubic root of 10000191 is about 215.4448406512. Note that the first 3 decimals are identical.

Adding to 10000191 its reverse (19100001), we get a palindrome (29100192).

The spelling of 10000191 in words is "ten million, one hundred ninety-one", and thus it is an aban number.