971209 has 4 divisors (see below), whose sum is σ = 984960. Its totient is φ = 957460.

The previous prime is 971207. The next prime is 971237. The reversal of 971209 is 902179.

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.

It is a cyclic number.

It is not a de Polignac number, because 971209 - 2¹ = 971207 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (971207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6769 + ... + 6910.

It is an arithmetic number, because the mean of its divisors is an integer number (246240).

2⁹⁷¹²⁰⁹ is an apocalyptic number.

It is an amenable number.

971209 is a deficient number, since it is larger than the sum of its proper divisors (13751).

971209 is a wasteful number, since it uses less digits than its factorization.

971209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13750.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 971209 is about 985.4993658040. The cubic root of 971209 is about 99.0309395526.

The spelling of 971209 in words is "nine hundred seventy-one thousand, two hundred nine".