331087 has 4 divisors (see below), whose sum is σ = 335160. Its totient is φ = 327016.

The previous prime is 331081. The next prime is 331099. The reversal of 331087 is 780133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780133 = 157 ⋅4969.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-331087 is a prime.

It is a Duffinian number.

331087 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1912 + ... + 2077.

It is an arithmetic number, because the mean of its divisors is an integer number (83790).

2³³¹⁰⁸⁷ is an apocalyptic number.

331087 is a deficient number, since it is larger than the sum of its proper divisors (4073).

331087 is an equidigital number, since it uses as much as digits as its factorization.

331087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 331087 is about 575.4015988855. The cubic root of 331087 is about 69.1800241940.

The spelling of 331087 in words is "three hundred thirty-one thousand, eighty-seven".