971687 has 4 divisors (see below), whose sum is σ = 980400. Its totient is φ = 962976.

The previous prime is 971683. The next prime is 971693. The reversal of 971687 is 786179.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 971687 - 2² = 971683 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 971687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4187 + ... + 4412.

It is an arithmetic number, because the mean of its divisors is an integer number (245100).

2⁹⁷¹⁶⁸⁷ is an apocalyptic number.

971687 is a deficient number, since it is larger than the sum of its proper divisors (8713).

971687 is a wasteful number, since it uses less digits than its factorization.

971687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8712.

The product of its digits is 21168, while the sum is 38.

The square root of 971687 is about 985.7418526166. The cubic root of 971687 is about 99.0471835761.

The spelling of 971687 in words is "nine hundred seventy-one thousand, six hundred eighty-seven".