216500351 has 4 divisors (see below), whose sum is σ = 217003104. Its totient is φ = 215997600.

The previous prime is 216500279. The next prime is 216500353. The reversal of 216500351 is 153005612.

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 216500351 - 2¹⁸ = 216238207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216500353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250730 + ... + 251591.

It is an arithmetic number, because the mean of its divisors is an integer number (54250776).

Almost surely, 2^216500351 is an apocalyptic number.

216500351 is a deficient number, since it is larger than the sum of its proper divisors (502753).

216500351 is an equidigital number, since it uses as much as digits as its factorization.

216500351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502752.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 216500351 is about 14713.9508970229. The cubic root of 216500351 is about 600.4629306964.

Adding to 216500351 its reverse (153005612), we get a palindrome (369505963).

The spelling of 216500351 in words is "two hundred sixteen million, five hundred thousand, three hundred fifty-one".