216934805 has 4 divisors (see below), whose sum is σ = 260321772. Its totient is φ = 173547840.

The previous prime is 216934793. The next prime is 216934831. The reversal of 216934805 is 508439612.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 68046001 + 148888804 = 8249^2 + 12202^2 .

It is not a de Polignac number, because 216934805 - 2¹⁸ = 216672661 is a prime.

It is a Duffinian number.

It is a congruent 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, 21693476 + ... + 21693485.

It is an arithmetic number, because the mean of its divisors is an integer number (65080443).

Almost surely, 2^216934805 is an apocalyptic number.

It is an amenable number.

216934805 is a deficient number, since it is larger than the sum of its proper divisors (43386967).

216934805 is an equidigital number, since it uses as much as digits as its factorization.

216934805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43386966.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 216934805 is about 14728.7068339349. The cubic root of 216934805 is about 600.8643145213.

The spelling of 216934805 in words is "two hundred sixteen million, nine hundred thirty-four thousand, eight hundred five".