987771 has 4 divisors (see below), whose sum is σ = 1317032. Its totient is φ = 658512.

The previous prime is 987739. The next prime is 987793. The reversal of 987771 is 177789.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 177789 = 3 ⋅59263.

It is not a de Polignac number, because 987771 - 2⁵ = 987739 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (987971) 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, 164626 + ... + 164631.

It is an arithmetic number, because the mean of its divisors is an integer number (329258).

2⁹⁸⁷⁷⁷¹ is an apocalyptic number.

987771 is a deficient number, since it is larger than the sum of its proper divisors (329261).

987771 is a wasteful number, since it uses less digits than its factorization.

987771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329260.

The product of its digits is 24696, while the sum is 39.

The square root of 987771 is about 993.8666912620. The cubic root of 987771 is about 99.5906936354.

The spelling of 987771 in words is "nine hundred eighty-seven thousand, seven hundred seventy-one".