987331 has 4 divisors (see below), whose sum is σ = 990352. Its totient is φ = 984312.

The previous prime is 987313. The next prime is 987353. The reversal of 987331 is 133789.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133789 = 337 ⋅397.

It is a cyclic number.

It is not a de Polignac number, because 987331 - 2⁵ = 987299 is a prime.

It is a super-2 number, since 2×987331² = 1949645007122, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 987293 and 987302.

It is not an unprimeable number, because it can be changed into a prime (987361) 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, 951 + ... + 1696.

It is an arithmetic number, because the mean of its divisors is an integer number (247588).

2⁹⁸⁷³³¹ is an apocalyptic number.

987331 is a deficient number, since it is larger than the sum of its proper divisors (3021).

987331 is a wasteful number, since it uses less digits than its factorization.

987331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020.

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

The square root of 987331 is about 993.6453089508. The cubic root of 987331 is about 99.5759039681.

The spelling of 987331 in words is "nine hundred eighty-seven thousand, three hundred thirty-one".