216290811 has 32 divisors (see below), whose sum is σ = 322479360. Its totient is φ = 127843200.

The previous prime is 216290801. The next prime is 216290819. The reversal of 216290811 is 118092612.

216290811 = 3125² + 3126² + ... + 3146².

It is a happy number.

It is not a de Polignac number, because 216290811 - 2¹⁴ = 216274427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216290819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 279421 + ... + 280193.

It is an arithmetic number, because the mean of its divisors is an integer number (10077480).

Almost surely, 2^216290811 is an apocalyptic number.

216290811 is a deficient number, since it is larger than the sum of its proper divisors (106188549).

216290811 is a wasteful number, since it uses less digits than its factorization.

216290811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 216290811 is about 14706.8287200198. The cubic root of 216290811 is about 600.2691486914.

The spelling of 216290811 in words is "two hundred sixteen million, two hundred ninety thousand, eight hundred eleven".