216123539 has 8 divisors (see below), whose sum is σ = 219629760. Its totient is φ = 212636736.

The previous prime is 216123517. The next prime is 216123569. The reversal of 216123539 is 935321612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216123539 is a prime.

It is a super-5 number, since 5×216123539⁵ (a number of 43 digits) contains 55555 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216123569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18479 + ... + 27815.

It is an arithmetic number, because the mean of its divisors is an integer number (27453720).

Almost surely, 2^216123539 is an apocalyptic number.

216123539 is a deficient number, since it is larger than the sum of its proper divisors (3506221).

216123539 is an equidigital number, since it uses as much as digits as its factorization.

216123539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9709.

The product of its digits is 9720, while the sum is 32.

The square root of 216123539 is about 14701.1407380516. The cubic root of 216123539 is about 600.1143661622.

The spelling of 216123539 in words is "two hundred sixteen million, one hundred twenty-three thousand, five hundred thirty-nine".