401191 has 8 divisors (see below), whose sum is σ = 471200. Its totient is φ = 334368.

The previous prime is 401179. The next prime is 401201. The reversal of 401191 is 191104.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(401191) divides (401191-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 401191 - 2⁹ = 400679 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 (401101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 516 + ... + 1033.

It is an arithmetic number, because the mean of its divisors is an integer number (58900).

2⁴⁰¹¹⁹¹ is an apocalyptic number.

401191 is a deficient number, since it is larger than the sum of its proper divisors (70009).

401191 is a wasteful number, since it uses less digits than its factorization.

401191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 401191 is about 633.3964003687. The cubic root of 401191 is about 73.7536855383.

Adding to 401191 its reverse (191104), we get a palindrome (592295).

The spelling of 401191 in words is "four hundred one thousand, one hundred ninety-one".