100216865 has 16 divisors (see below), whose sum is σ = 143417088. Its totient is φ = 65731776.

The previous prime is 100216829. The next prime is 100216871. The reversal of 100216865 is 568612001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 100216865 - 2¹² = 100212769 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61442 + ... + 63051.

It is an arithmetic number, because the mean of its divisors is an integer number (8963568).

Almost surely, 2^100216865 is an apocalyptic number.

It is an amenable number.

100216865 is a deficient number, since it is larger than the sum of its proper divisors (43200223).

100216865 is a wasteful number, since it uses less digits than its factorization.

100216865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124528.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 100216865 is about 10010.8373775624. The cubic root of 100216865 is about 464.4941738229.

Adding to 100216865 its reverse (568612001), we get a palindrome (668828866).

The spelling of 100216865 in words is "one hundred million, two hundred sixteen thousand, eight hundred sixty-five".