216730551 has 16 divisors (see below), whose sum is σ = 296660448. Its totient is φ = 140659200.

The previous prime is 216730529. The next prime is 216730559. The reversal of 216730551 is 155037612.

It is not a de Polignac number, because 216730551 - 2⁶ = 216730487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216730559) 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 15 ways as a sum of consecutive naturals, for example, 64915 + ... + 68171.

It is an arithmetic number, because the mean of its divisors is an integer number (18541278).

Almost surely, 2^216730551 is an apocalyptic number.

216730551 is a deficient number, since it is larger than the sum of its proper divisors (79929897).

216730551 is a wasteful number, since it uses less digits than its factorization.

216730551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3842.

The product of its (nonzero) digits is 6300, while the sum is 30.

The square root of 216730551 is about 14721.7713268479. The cubic root of 216730551 is about 600.6756749311.

The spelling of 216730551 in words is "two hundred sixteen million, seven hundred thirty thousand, five hundred fifty-one".