216434915 has 4 divisors (see below), whose sum is σ = 259721904. Its totient is φ = 173147928.

The previous prime is 216434903. The next prime is 216434923. The reversal of 216434915 is 519434612.

216434915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216434915 - 2⁶ = 216434851 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21643487 + ... + 21643496.

It is an arithmetic number, because the mean of its divisors is an integer number (64930476).

Almost surely, 2^216434915 is an apocalyptic number.

216434915 is a deficient number, since it is larger than the sum of its proper divisors (43286989).

216434915 is an equidigital number, since it uses as much as digits as its factorization.

216434915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43286988.

The product of its digits is 25920, while the sum is 35.

The square root of 216434915 is about 14711.7271249843. The cubic root of 216434915 is about 600.4024290984.

The spelling of 216434915 in words is "two hundred sixteen million, four hundred thirty-four thousand, nine hundred fifteen".