16809811 has 2 divisors, whose sum is σ = 16809812. Its totient is φ = 16809810.

The previous prime is 16809791. The next prime is 16809817. The reversal of 16809811 is 11890861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16809811 - 2¹⁹ = 16285523 is a prime.

It is not a weakly prime, because it can be changed into another prime (16809817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8404905 + 8404906.

It is an arithmetic number, because the mean of its divisors is an integer number (8404906).

Almost surely, 2^16809811 is an apocalyptic number.

16809811 is a deficient number, since it is larger than the sum of its proper divisors (1).

16809811 is an equidigital number, since it uses as much as digits as its factorization.

16809811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 16809811 is about 4099.9769511547. The cubic root of 16809811 is about 256.1656794947.

The spelling of 16809811 in words is "sixteen million, eight hundred nine thousand, eight hundred eleven".