216552811 has 4 divisors (see below), whose sum is σ = 216752032. Its totient is φ = 216353592.

The previous prime is 216552767. The next prime is 216552827. The reversal of 216552811 is 118255612.

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 216552811 - 2⁹ = 216552299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216552211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97971 + ... + 100156.

It is an arithmetic number, because the mean of its divisors is an integer number (54188008).

Almost surely, 2^216552811 is an apocalyptic number.

216552811 is a deficient number, since it is larger than the sum of its proper divisors (199221).

216552811 is a wasteful number, since it uses less digits than its factorization.

216552811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199220.

The product of its digits is 4800, while the sum is 31.

The square root of 216552811 is about 14715.7334509701. The cubic root of 216552811 is about 600.5114259856.

The spelling of 216552811 in words is "two hundred sixteen million, five hundred fifty-two thousand, eight hundred eleven".