331019993 has 4 divisors (see below), whose sum is σ = 331078308. Its totient is φ = 330961680.

The previous prime is 331019989. The next prime is 331020023. The reversal of 331019993 is 399910133.

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

It can be written as a sum of positive squares in 2 ways, for example, as 124724224 + 206295769 = 11168^2 + 14363^2 .

It is a cyclic number.

It is not a de Polignac number, because 331019993 - 2² = 331019989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331019693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19598 + ... + 32343.

It is an arithmetic number, because the mean of its divisors is an integer number (82769577).

Almost surely, 2^331019993 is an apocalyptic number.

It is an amenable number.

331019993 is a deficient number, since it is larger than the sum of its proper divisors (58315).

331019993 is an equidigital number, since it uses as much as digits as its factorization.

331019993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58314.

The product of its (nonzero) digits is 19683, while the sum is 38.

The square root of 331019993 is about 18193.9548476960. The cubic root of 331019993 is about 691.7535688233.

The spelling of 331019993 in words is "three hundred thirty-one million, nineteen thousand, nine hundred ninety-three".