331366393 has 2 divisors, whose sum is σ = 331366394. Its totient is φ = 331366392.

The previous prime is 331366391. The next prime is 331366429. The reversal of 331366393 is 393663133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211179024 + 120187369 = 14532^2 + 10963^2 .

It is an emirp because it is prime and its reverse (393663133) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 331366393 - 2¹ = 331366391 is a prime.

Together with 331366391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (331366391) 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, 165683196 + 165683197.

It is an arithmetic number, because the mean of its divisors is an integer number (165683197).

Almost surely, 2^331366393 is an apocalyptic number.

It is an amenable number.

331366393 is a deficient number, since it is larger than the sum of its proper divisors (1).

331366393 is an equidigital number, since it uses as much as digits as its factorization.

331366393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78732, while the sum is 37.

The square root of 331366393 is about 18203.4720039887. The cubic root of 331366393 is about 691.9947827522.

The spelling of 331366393 in words is "three hundred thirty-one million, three hundred sixty-six thousand, three hundred ninety-three".