216600979 has 4 divisors (see below), whose sum is σ = 247543984. Its totient is φ = 185657976.

The previous prime is 216600947. The next prime is 216601031. The reversal of 216600979 is 979006612.

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

It is not a de Polignac number, because 216600979 - 2⁵ = 216600947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216600929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15471492 + ... + 15471505.

It is an arithmetic number, because the mean of its divisors is an integer number (61885996).

Almost surely, 2^216600979 is an apocalyptic number.

216600979 is a deficient number, since it is larger than the sum of its proper divisors (30943005).

216600979 is an equidigital number, since it uses as much as digits as its factorization.

216600979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30943004.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 216600979 is about 14717.3699756444. The cubic root of 216600979 is about 600.5559467500. Note that the first 3 decimals are identical.

The spelling of 216600979 in words is "two hundred sixteen million, six hundred thousand, nine hundred seventy-nine".