987197 has 4 divisors (see below), whose sum is σ = 1013916. Its totient is φ = 960480.

The previous prime is 987193. The next prime is 987199. The reversal of 987197 is 791789.

987197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 337561 + 649636 = 581^2 + 806^2 .

It is a cyclic number.

It is not a de Polignac number, because 987197 - 2² = 987193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987191) 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, 13304 + ... + 13377.

It is an arithmetic number, because the mean of its divisors is an integer number (253479).

2⁹⁸⁷¹⁹⁷ is an apocalyptic number.

It is an amenable number.

987197 is a deficient number, since it is larger than the sum of its proper divisors (26719).

987197 is a wasteful number, since it uses less digits than its factorization.

987197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26718.

The product of its digits is 31752, while the sum is 41.

The square root of 987197 is about 993.5778781756. The cubic root of 987197 is about 99.5713989693.

The spelling of 987197 in words is "nine hundred eighty-seven thousand, one hundred ninety-seven".