216500001 has 16 divisors (see below), whose sum is σ = 304324608. Its totient is φ = 136702800.

The previous prime is 216499999. The next prime is 216500021. The reversal of 216500001 is 100005612.

216500001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216500001 - 2¹ = 216499999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216500021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20395 + ... + 29136.

It is an arithmetic number, because the mean of its divisors is an integer number (19020288).

Almost surely, 2^216500001 is an apocalyptic number.

It is an amenable number.

216500001 is a deficient number, since it is larger than the sum of its proper divisors (87824607).

216500001 is a wasteful number, since it uses less digits than its factorization.

216500001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49612.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 216500001 is about 14713.9390035435. The cubic root of 216500001 is about 600.4626071216.

Adding to 216500001 its reverse (100005612), we get a palindrome (316505613).

The spelling of 216500001 in words is "two hundred sixteen million, five hundred thousand, one".