216815059 has 4 divisors (see below), whose sum is σ = 229568904. Its totient is φ = 204061216.

The previous prime is 216815057. The next prime is 216815069. The reversal of 216815059 is 950518612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216815059 - 2¹ = 216815057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216815051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6376897 + ... + 6376930.

It is an arithmetic number, because the mean of its divisors is an integer number (57392226).

Almost surely, 2^216815059 is an apocalyptic number.

216815059 is a deficient number, since it is larger than the sum of its proper divisors (12753845).

216815059 is a wasteful number, since it uses less digits than its factorization.

216815059 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12753844.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 216815059 is about 14724.6412180399. The cubic root of 216815059 is about 600.7537369970.

The spelling of 216815059 in words is "two hundred sixteen million, eight hundred fifteen thousand, fifty-nine".