18009461 has 2 divisors, whose sum is σ = 18009462. Its totient is φ = 18009460.

The previous prime is 18009421. The next prime is 18009463. The reversal of 18009461 is 16490081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13032100 + 4977361 = 3610^2 + 2231^2 .

It is a cyclic number.

It is not a de Polignac number, because 18009461 - 2¹⁴ = 17993077 is a prime.

Together with 18009463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18009463) 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, 9004730 + 9004731.

It is an arithmetic number, because the mean of its divisors is an integer number (9004731).

Almost surely, 2^18009461 is an apocalyptic number.

It is an amenable number.

18009461 is a deficient number, since it is larger than the sum of its proper divisors (1).

18009461 is an equidigital number, since it uses as much as digits as its factorization.

18009461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18009461 is about 4243.7555301879. The cubic root of 18009461 is about 262.1200477384.

The spelling of 18009461 in words is "eighteen million, nine thousand, four hundred sixty-one".