971689 has 4 divisors (see below), whose sum is σ = 974160. Its totient is φ = 969220.

The previous prime is 971683. The next prime is 971693. The reversal of 971689 is 986179.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 986179 = 251 ⋅3929.

It is a cyclic number.

It is not a de Polignac number, because 971689 - 2⁷ = 971561 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (971683) 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, 499 + ... + 1480.

It is an arithmetic number, because the mean of its divisors is an integer number (243540).

2⁹⁷¹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

971689 is a deficient number, since it is larger than the sum of its proper divisors (2471).

971689 is a wasteful number, since it uses less digits than its factorization.

971689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470.

The product of its digits is 27216, while the sum is 40.

The square root of 971689 is about 985.7428670805. The cubic root of 971689 is about 99.0472515315.

The spelling of 971689 in words is "nine hundred seventy-one thousand, six hundred eighty-nine".