216523073 has 8 divisors (see below), whose sum is σ = 237579048. Its totient is φ = 196095744.

The previous prime is 216523061. The next prime is 216523117. The reversal of 216523073 is 370325612.

216523073 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3713329 + 212809744 = 1927^2 + 14588^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216523073 - 2⁴ = 216523057 is a prime.

It is a super-2 number, since 2×216523073² = 93764482282726658, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216523673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156440 + ... + 157817.

It is an arithmetic number, because the mean of its divisors is an integer number (29697381).

Almost surely, 2^216523073 is an apocalyptic number.

It is an amenable number.

216523073 is a deficient number, since it is larger than the sum of its proper divisors (21055975).

216523073 is a wasteful number, since it uses less digits than its factorization.

216523073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314323.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 216523073 is about 14714.7230011305. The cubic root of 216523073 is about 600.4839364228.

Adding to 216523073 its reverse (370325612), we get a palindrome (586848685).

The spelling of 216523073 in words is "two hundred sixteen million, five hundred twenty-three thousand, seventy-three".