18061273 has 2 divisors, whose sum is σ = 18061274. Its totient is φ = 18061272.

The previous prime is 18061271. The next prime is 18061283. The reversal of 18061273 is 37216081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15618304 + 2442969 = 3952^2 + 1563^2 .

It is a cyclic number.

It is not a de Polignac number, because 18061273 - 2¹ = 18061271 is a prime.

Together with 18061271, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18061271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9030636 + 9030637.

It is an arithmetic number, because the mean of its divisors is an integer number (9030637).

Almost surely, 2^18061273 is an apocalyptic number.

It is an amenable number.

18061273 is a deficient number, since it is larger than the sum of its proper divisors (1).

18061273 is an equidigital number, since it uses as much as digits as its factorization.

18061273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 18061273 is about 4249.8556446072. The cubic root of 18061273 is about 262.3711742778.

The spelling of 18061273 in words is "eighteen million, sixty-one thousand, two hundred seventy-three".