331387 has 6 divisors (see below), whose sum is σ = 385548. Its totient is φ = 284004.

The previous prime is 331369. The next prime is 331391. The reversal of 331387 is 783133.

It is not a de Polignac number, because 331387 - 2⁷ = 331259 is a prime.

It is a Duffinian number.

331387 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (331307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3333 + ... + 3430.

It is an arithmetic number, because the mean of its divisors is an integer number (64258).

2³³¹³⁸⁷ is an apocalyptic number.

331387 is a deficient number, since it is larger than the sum of its proper divisors (54161).

331387 is an equidigital number, since it uses as much as digits as its factorization.

331387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6777 (or 6770 counting only the distinct ones).

The product of its digits is 1512, while the sum is 25.

The square root of 331387 is about 575.6622273521. The cubic root of 331387 is about 69.2009127036.

The spelling of 331387 in words is "three hundred thirty-one thousand, three hundred eighty-seven".