331000399 has 2 divisors, whose sum is σ = 331000400. Its totient is φ = 331000398.

The previous prime is 331000393. The next prime is 331000427. The reversal of 331000399 is 993000133.

It is a happy number.

It is an a-pointer prime, because the next prime (331000427) can be obtained adding 331000399 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 331000399 - 2¹¹ = 330998351 is a prime.

It is a super-2 number, since 2×331000399² = 219122528276318402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (331000393) 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, 165500199 + 165500200.

It is an arithmetic number, because the mean of its divisors is an integer number (165500200).

Almost surely, 2^331000399 is an apocalyptic number.

331000399 is a deficient number, since it is larger than the sum of its proper divisors (1).

331000399 is an equidigital number, since it uses as much as digits as its factorization.

331000399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187, while the sum is 28.

The square root of 331000399 is about 18193.4163641687. The cubic root of 331000399 is about 691.7399196106.

The spelling of 331000399 in words is "three hundred thirty-one million, three hundred ninety-nine", and thus it is an aban number.