216927965 has 4 divisors (see below), whose sum is σ = 260313564. Its totient is φ = 173542368.

The previous prime is 216927961. The next prime is 216927967. The reversal of 216927965 is 569729612.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41550916 + 175377049 = 6446^2 + 13243^2 .

It is a cyclic number.

It is not a de Polignac number, because 216927965 - 2² = 216927961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216927961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21692792 + ... + 21692801.

It is an arithmetic number, because the mean of its divisors is an integer number (65078391).

Almost surely, 2^216927965 is an apocalyptic number.

It is an amenable number.

216927965 is a deficient number, since it is larger than the sum of its proper divisors (43385599).

216927965 is an equidigital number, since it uses as much as digits as its factorization.

216927965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43385598.

The product of its digits is 408240, while the sum is 47.

The square root of 216927965 is about 14728.4746324933. The cubic root of 216927965 is about 600.8579993289.

The spelling of 216927965 in words is "two hundred sixteen million, nine hundred twenty-seven thousand, nine hundred sixty-five".