331316891 has 4 divisors (see below), whose sum is σ = 332982000. Its totient is φ = 329651784.

The previous prime is 331316879. The next prime is 331316899. The reversal of 331316891 is 198613133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198613133 = 61 ⋅3255953.

It is a cyclic number.

It is not a de Polignac number, because 331316891 - 2¹⁰ = 331315867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331316899) 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, 832256 + ... + 832653.

It is an arithmetic number, because the mean of its divisors is an integer number (83245500).

Almost surely, 2^331316891 is an apocalyptic number.

331316891 is a deficient number, since it is larger than the sum of its proper divisors (1665109).

331316891 is a wasteful number, since it uses less digits than its factorization.

331316891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665108.

The product of its digits is 11664, while the sum is 35.

The square root of 331316891 is about 18202.1122675364. The cubic root of 331316891 is about 691.9603225772.

The spelling of 331316891 in words is "three hundred thirty-one million, three hundred sixteen thousand, eight hundred ninety-one".