216493073 has 4 divisors (see below), whose sum is σ = 216563508. Its totient is φ = 216422640.

The previous prime is 216493051. The next prime is 216493093. The reversal of 216493073 is 370394612.

216493073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 144192064 + 72301009 = 12008^2 + 8503^2 .

It is a cyclic number.

It is not a de Polignac number, because 216493073 - 2⁸ = 216492817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216493093) 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, 30386 + ... + 36827.

It is an arithmetic number, because the mean of its divisors is an integer number (54140877).

Almost surely, 2^216493073 is an apocalyptic number.

It is an amenable number.

216493073 is a deficient number, since it is larger than the sum of its proper divisors (70435).

216493073 is an equidigital number, since it uses as much as digits as its factorization.

216493073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70434.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 216493073 is about 14713.7035786372. The cubic root of 216493073 is about 600.4562021189.

The spelling of 216493073 in words is "two hundred sixteen million, four hundred ninety-three thousand, seventy-three".