216547423 has 4 divisors (see below), whose sum is σ = 216590328. Its totient is φ = 216504520.

The previous prime is 216547399. The next prime is 216547451. The reversal of 216547423 is 324745612.

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 216547423 - 2¹³ = 216539231 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 (216547483) 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, 12688 + ... + 24373.

It is an arithmetic number, because the mean of its divisors is an integer number (54147582).

Almost surely, 2^216547423 is an apocalyptic number.

216547423 is a deficient number, since it is larger than the sum of its proper divisors (42905).

216547423 is an equidigital number, since it uses as much as digits as its factorization.

216547423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42904.

The product of its digits is 40320, while the sum is 34.

The square root of 216547423 is about 14715.5503804649. The cubic root of 216547423 is about 600.5064455494.

The spelling of 216547423 in words is "two hundred sixteen million, five hundred forty-seven thousand, four hundred twenty-three".