331664191 has 2 divisors, whose sum is σ = 331664192. Its totient is φ = 331664190.

The previous prime is 331664173. The next prime is 331664197. The reversal of 331664191 is 191466133.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (191466133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331664191 - 2⁷ = 331664063 is a prime.

It is a super-2 number, since 2×331664191² = 220002271183368962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331664197) 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 as a sum of consecutive naturals, namely, 165832095 + 165832096.

It is an arithmetic number, because the mean of its divisors is an integer number (165832096).

Almost surely, 2^331664191 is an apocalyptic number.

331664191 is a deficient number, since it is larger than the sum of its proper divisors (1).

331664191 is an equidigital number, since it uses as much as digits as its factorization.

331664191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 34.

The square root of 331664191 is about 18211.6498703440. The cubic root of 331664191 is about 692.2020185739.

The spelling of 331664191 in words is "three hundred thirty-one million, six hundred sixty-four thousand, one hundred ninety-one".