216459811 has 2 divisors, whose sum is σ = 216459812. Its totient is φ = 216459810.

The previous prime is 216459743. The next prime is 216459821. The reversal of 216459811 is 118954612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216459811 is a prime.

It is not a weakly prime, because it can be changed into another prime (216459821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108229905 + 108229906.

It is an arithmetic number, because the mean of its divisors is an integer number (108229906).

Almost surely, 2^216459811 is an apocalyptic number.

216459811 is a deficient number, since it is larger than the sum of its proper divisors (1).

216459811 is an equidigital number, since it uses as much as digits as its factorization.

216459811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 37.

The square root of 216459811 is about 14712.5732283649. The cubic root of 216459811 is about 600.4254491763.

The spelling of 216459811 in words is "two hundred sixteen million, four hundred fifty-nine thousand, eight hundred eleven".