16530979 has 4 divisors (see below), whose sum is σ = 16543584. Its totient is φ = 16518376.

The previous prime is 16530961. The next prime is 16530989. The reversal of 16530979 is 97903561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16530979 - 2⁵ = 16530947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16530929) 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, 4072 + ... + 7045.

It is an arithmetic number, because the mean of its divisors is an integer number (4135896).

Almost surely, 2^16530979 is an apocalyptic number.

16530979 is a deficient number, since it is larger than the sum of its proper divisors (12605).

16530979 is a wasteful number, since it uses less digits than its factorization.

16530979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12604.

The product of its (nonzero) digits is 51030, while the sum is 40.

The square root of 16530979 is about 4065.8306654360. The cubic root of 16530979 is about 254.7413961666.

The spelling of 16530979 in words is "sixteen million, five hundred thirty thousand, nine hundred seventy-nine".