7971009 has 4 divisors (see below), whose sum is σ = 10628016. Its totient is φ = 5314004.

The previous prime is 7970993. The next prime is 7971017. The reversal of 7971009 is 9001797.

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 7971009 - 2⁴ = 7970993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7971109) 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, 1328499 + ... + 1328504.

It is an arithmetic number, because the mean of its divisors is an integer number (2657004).

Almost surely, 2^7971009 is an apocalyptic number.

It is an amenable number.

7971009 is a deficient number, since it is larger than the sum of its proper divisors (2657007).

7971009 is a wasteful number, since it uses less digits than its factorization.

7971009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657006.

The product of its (nonzero) digits is 3969, while the sum is 33.

The square root of 7971009 is about 2823.2975401116. The cubic root of 7971009 is about 199.7581159117.

The spelling of 7971009 in words is "seven million, nine hundred seventy-one thousand, nine".