216513273 has 4 divisors (see below), whose sum is σ = 288684368. Its totient is φ = 144342180.

The previous prime is 216513239. The next prime is 216513287. The reversal of 216513273 is 372315612.

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 not a de Polignac number, because 216513273 - 2⁹ = 216512761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216513273.

It is not an unprimeable number, because it can be changed into a prime (216513203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36085543 + ... + 36085548.

It is an arithmetic number, because the mean of its divisors is an integer number (72171092).

Almost surely, 2^216513273 is an apocalyptic number.

It is an amenable number.

216513273 is a deficient number, since it is larger than the sum of its proper divisors (72171095).

216513273 is an equidigital number, since it uses as much as digits as its factorization.

216513273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72171094.

The product of its digits is 7560, while the sum is 30.

The square root of 216513273 is about 14714.3899975500. The cubic root of 216513273 is about 600.4748768319.

Adding to 216513273 its reverse (372315612), we get a palindrome (588828885).

The spelling of 216513273 in words is "two hundred sixteen million, five hundred thirteen thousand, two hundred seventy-three".