331987 has 8 divisors (see below), whose sum is σ = 354960. Its totient is φ = 309600.

The previous prime is 331973. The next prime is 331997. The reversal of 331987 is 789133.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331987 is a prime.

It is a super-2 number, since 2×331987² = 220430736338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1833 + ... + 2005.

It is an arithmetic number, because the mean of its divisors is an integer number (44370).

2³³¹⁹⁸⁷ is an apocalyptic number.

331987 is a deficient number, since it is larger than the sum of its proper divisors (22973).

331987 is a wasteful number, since it uses less digits than its factorization.

331987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293.

The product of its digits is 4536, while the sum is 31.

The square root of 331987 is about 576.1831306104. The cubic root of 331987 is about 69.2426519331.

The spelling of 331987 in words is "three hundred thirty-one thousand, nine hundred eighty-seven".