404102191 has 4 divisors (see below), whose sum is σ = 413958384. Its totient is φ = 394246000.

The previous prime is 404102161. The next prime is 404102201. The reversal of 404102191 is 191201404.

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

It is a cyclic number.

It is not a de Polignac number, because 404102191 - 2¹⁹ = 403577903 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 (404102161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4928035 + ... + 4928116.

It is an arithmetic number, because the mean of its divisors is an integer number (103489596).

Almost surely, 2^404102191 is an apocalyptic number.

404102191 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

404102191 is a deficient number, since it is larger than the sum of its proper divisors (9856193).

404102191 is an equidigital number, since it uses as much as digits as its factorization.

404102191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9856192.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 404102191 is about 20102.2931776452. The cubic root of 404102191 is about 739.3165048769.

Adding to 404102191 its reverse (191201404), we get a palindrome (595303595).

The spelling of 404102191 in words is "four hundred four million, one hundred two thousand, one hundred ninety-one".