331309387 has 2 divisors, whose sum is σ = 331309388. Its totient is φ = 331309386.

The previous prime is 331309313. The next prime is 331309469. The reversal of 331309387 is 783903133.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331309387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (331309487) 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, 165654693 + 165654694.

It is an arithmetic number, because the mean of its divisors is an integer number (165654694).

Almost surely, 2^331309387 is an apocalyptic number.

331309387 is a deficient number, since it is larger than the sum of its proper divisors (1).

331309387 is an equidigital number, since it uses as much as digits as its factorization.

331309387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 331309387 is about 18201.9061364463. The cubic root of 331309387 is about 691.9550984654.

The spelling of 331309387 in words is "three hundred thirty-one million, three hundred nine thousand, three hundred eighty-seven".