216138515 has 8 divisors (see below), whose sum is σ = 259830288. Its totient is φ = 172601440.

The previous prime is 216138499. The next prime is 216138523. The reversal of 216138515 is 515831612.

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

It is not a de Polignac number, because 216138515 - 2⁴ = 216138499 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35576 + ... + 41205.

It is an arithmetic number, because the mean of its divisors is an integer number (32478786).

Almost surely, 2^216138515 is an apocalyptic number.

216138515 is a deficient number, since it is larger than the sum of its proper divisors (43691773).

216138515 is an equidigital number, since it uses as much as digits as its factorization.

216138515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77349.

The product of its digits is 7200, while the sum is 32.

The square root of 216138515 is about 14701.6500774573. The cubic root of 216138515 is about 600.1282272240.

The spelling of 216138515 in words is "two hundred sixteen million, one hundred thirty-eight thousand, five hundred fifteen".