216009045 has 32 divisors (see below), whose sum is σ = 438877440. Its totient is φ = 98746560.

The previous prime is 216009037. The next prime is 216009047. The reversal of 216009045 is 540900612.

It is not a de Polignac number, because 216009045 - 2³ = 216009037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216009047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113346 + ... + 115235.

It is an arithmetic number, because the mean of its divisors is an integer number (13714920).

Almost surely, 2^216009045 is an apocalyptic number.

It is an amenable number.

216009045 is an abundant number, since it is smaller than the sum of its proper divisors (222868395).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216009045 is a wasteful number, since it uses less digits than its factorization.

216009045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228602 (or 228596 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 216009045 is about 14697.2461706267. The cubic root of 216009045 is about 600.0083748831.

Adding to 216009045 its reverse (540900612), we get a palindrome (756909657).

The spelling of 216009045 in words is "two hundred sixteen million, nine thousand, forty-five".