18265811 has 2 divisors, whose sum is σ = 18265812. Its totient is φ = 18265810.

The previous prime is 18265801. The next prime is 18265817. The reversal of 18265811 is 11856281.

It is a strong prime.

It is an emirp because it is prime and its reverse (11856281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18265811 - 2⁶ = 18265747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18265817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9132905 + 9132906.

It is an arithmetic number, because the mean of its divisors is an integer number (9132906).

Almost surely, 2^18265811 is an apocalyptic number.

18265811 is a deficient number, since it is larger than the sum of its proper divisors (1).

18265811 is an equidigital number, since it uses as much as digits as its factorization.

18265811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 32.

The square root of 18265811 is about 4273.8520096045. The cubic root of 18265811 is about 263.3578814196.

The spelling of 18265811 in words is "eighteen million, two hundred sixty-five thousand, eight hundred eleven".