331604191 has 4 divisors (see below), whose sum is σ = 332980384. Its totient is φ = 330228000.

The previous prime is 331604171. The next prime is 331604197. The reversal of 331604191 is 191406133.

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 331604191 - 2¹¹ = 331602143 is a prime.

It is a super-2 number, since 2×331604191² = 219922678977528962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331604197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687735 + ... + 688216.

It is an arithmetic number, because the mean of its divisors is an integer number (83245096).

Almost surely, 2^331604191 is an apocalyptic number.

331604191 is a deficient number, since it is larger than the sum of its proper divisors (1376193).

331604191 is a wasteful number, since it uses less digits than its factorization.

331604191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376192.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 331604191 is about 18210.0024986270. The cubic root of 331604191 is about 692.1602749197.

The spelling of 331604191 in words is "three hundred thirty-one million, six hundred four thousand, one hundred ninety-one".