979021009 has 4 divisors (see below), whose sum is σ = 991413760. Its totient is φ = 966628260.

The previous prime is 979020997. The next prime is 979021061. The reversal of 979021009 is 900120979.

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: 900120979 = 199 ⋅4523221.

It is a cyclic number.

It is not a de Polignac number, because 979021009 - 2¹³ = 979012817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (979021409) 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, 6196257 + ... + 6196414.

It is an arithmetic number, because the mean of its divisors is an integer number (247853440).

Almost surely, 2^979021009 is an apocalyptic number.

It is an amenable number.

979021009 is a deficient number, since it is larger than the sum of its proper divisors (12392751).

979021009 is a wasteful number, since it uses less digits than its factorization.

979021009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12392750.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 979021009 is about 31289.3114177989. The cubic root of 979021009 is about 992.9575229443.

The spelling of 979021009 in words is "nine hundred seventy-nine million, twenty-one thousand, nine".