216549023 has 4 divisors (see below), whose sum is σ = 227946360. Its totient is φ = 205151688.

The previous prime is 216549017. The next prime is 216549029. The reversal of 216549023 is 320945612.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (216549017) and next prime (216549029).

It is a cyclic number.

It is not a de Polignac number, because 216549023 - 2⁴ = 216549007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216549029) 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, 5698640 + ... + 5698677.

It is an arithmetic number, because the mean of its divisors is an integer number (56986590).

Almost surely, 2^216549023 is an apocalyptic number.

216549023 is a deficient number, since it is larger than the sum of its proper divisors (11397337).

216549023 is a wasteful number, since it uses less digits than its factorization.

216549023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11397336.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 216549023 is about 14715.6047446240. The cubic root of 216549023 is about 600.5079245294.

The spelling of 216549023 in words is "two hundred sixteen million, five hundred forty-nine thousand, twenty-three".