216788973 has 4 divisors (see below), whose sum is σ = 289051968. Its totient is φ = 144525980.

The previous prime is 216788969. The next prime is 216788977. The reversal of 216788973 is 379887612.

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 an interprime number because it is at equal distance from previous prime (216788969) and next prime (216788977).

It is a cyclic number.

It is not a de Polignac number, because 216788973 - 2² = 216788969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216788977) 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, 36131493 + ... + 36131498.

It is an arithmetic number, because the mean of its divisors is an integer number (72262992).

Almost surely, 2^216788973 is an apocalyptic number.

It is an amenable number.

216788973 is a deficient number, since it is larger than the sum of its proper divisors (72262995).

216788973 is an equidigital number, since it uses as much as digits as its factorization.

216788973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72262994.

The product of its digits is 1016064, while the sum is 51.

The square root of 216788973 is about 14723.7553973163. The cubic root of 216788973 is about 600.7296428980.

The spelling of 216788973 in words is "two hundred sixteen million, seven hundred eighty-eight thousand, nine hundred seventy-three".