216509315 has 16 divisors (see below), whose sum is σ = 290346336. Its totient is φ = 153619200.

The previous prime is 216509309. The next prime is 216509353. The reversal of 216509315 is 513905612.

It is not a de Polignac number, because 216509315 - 2²² = 212315011 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45752 + ... + 50261.

It is an arithmetic number, because the mean of its divisors is an integer number (18146646).

Almost surely, 2^216509315 is an apocalyptic number.

216509315 is a deficient number, since it is larger than the sum of its proper divisors (73837021).

216509315 is a wasteful number, since it uses less digits than its factorization.

216509315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96070.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 216509315 is about 14714.2555027429. The cubic root of 216509315 is about 600.4712177891.

The spelling of 216509315 in words is "two hundred sixteen million, five hundred nine thousand, three hundred fifteen".