216432085 has 4 divisors (see below), whose sum is σ = 259718508. Its totient is φ = 173145664.

The previous prime is 216432077. The next prime is 216432091. The reversal of 216432085 is 580234612.

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 72216004 + 144216081 = 8498^2 + 12009^2 .

It is a cyclic number.

It is not a de Polignac number, because 216432085 - 2³ = 216432077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21643204 + ... + 21643213.

It is an arithmetic number, because the mean of its divisors is an integer number (64929627).

Almost surely, 2^216432085 is an apocalyptic number.

It is an amenable number.

216432085 is a deficient number, since it is larger than the sum of its proper divisors (43286423).

216432085 is an equidigital number, since it uses as much as digits as its factorization.

216432085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43286422.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 216432085 is about 14711.6309428968. The cubic root of 216432085 is about 600.3998122282.

Adding to 216432085 its reverse (580234612), we get a palindrome (796666697).

The spelling of 216432085 in words is "two hundred sixteen million, four hundred thirty-two thousand, eighty-five".