1971009 has 6 divisors (see below), whose sum is σ = 2847026. Its totient is φ = 1314000.

The previous prime is 1971007. The next prime is 1971023. The reversal of 1971009 is 9001791.

It can be written as a sum of positive squares in only one way, i.e., 1166400 + 804609 = 1080^2 + 897^2 .

It is not a de Polignac number, because 1971009 - 2¹ = 1971007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1971007) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109492 + ... + 109509.

2^1971009 is an apocalyptic number.

It is an amenable number.

1971009 is a deficient number, since it is larger than the sum of its proper divisors (876017).

1971009 is a wasteful number, since it uses less digits than its factorization.

1971009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219007 (or 219004 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 1971009 is about 1403.9262801159. The cubic root of 1971009 is about 125.3803667286.

The spelling of 1971009 in words is "one million, nine hundred seventy-one thousand, nine".