331210993 has 2 divisors, whose sum is σ = 331210994. Its totient is φ = 331210992.

The previous prime is 331210991. The next prime is 331211033. The reversal of 331210993 is 399012133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211789809 + 119421184 = 14553^2 + 10928^2 .

It is a cyclic number.

It is not a de Polignac number, because 331210993 - 2¹ = 331210991 is a prime.

Together with 331210991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (331210991) 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, 165605496 + 165605497.

It is an arithmetic number, because the mean of its divisors is an integer number (165605497).

Almost surely, 2^331210993 is an apocalyptic number.

It is an amenable number.

331210993 is a deficient number, since it is larger than the sum of its proper divisors (1).

331210993 is an equidigital number, since it uses as much as digits as its factorization.

331210993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4374, while the sum is 31.

The square root of 331210993 is about 18199.2030869486. The cubic root of 331210993 is about 691.8865915312.

The spelling of 331210993 in words is "three hundred thirty-one million, two hundred ten thousand, nine hundred ninety-three".