213664811 has 2 divisors, whose sum is σ = 213664812. Its totient is φ = 213664810.

The previous prime is 213664753. The next prime is 213664819. The reversal of 213664811 is 118466312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 213664811 - 2¹⁴ = 213648427 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213664819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106832405 + 106832406.

It is an arithmetic number, because the mean of its divisors is an integer number (106832406).

Almost surely, 2^213664811 is an apocalyptic number.

213664811 is a deficient number, since it is larger than the sum of its proper divisors (1).

213664811 is an equidigital number, since it uses as much as digits as its factorization.

213664811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 32.

The square root of 213664811 is about 14617.2778245472. The cubic root of 213664811 is about 597.8299488887.

The spelling of 213664811 in words is "two hundred thirteen million, six hundred sixty-four thousand, eight hundred eleven".