216310505 has 8 divisors (see below), whose sum is σ = 263447232. Its totient is φ = 170465328.

The previous prime is 216310489. The next prime is 216310513. The reversal of 216310505 is 505013612.

216310505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 216310505 - 2⁴ = 216310489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322517 + ... + 323186.

It is an arithmetic number, because the mean of its divisors is an integer number (32930904).

Almost surely, 2^216310505 is an apocalyptic number.

It is an amenable number.

216310505 is a deficient number, since it is larger than the sum of its proper divisors (47136727).

216310505 is an equidigital number, since it uses as much as digits as its factorization.

216310505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645775.

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

The square root of 216310505 is about 14707.4982576916. The cubic root of 216310505 is about 600.2873669747.

The spelling of 216310505 in words is "two hundred sixteen million, three hundred ten thousand, five hundred five".