18061481 has 2 divisors, whose sum is σ = 18061482. Its totient is φ = 18061480.

The previous prime is 18061471. The next prime is 18061487. The reversal of 18061481 is 18416081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17682025 + 379456 = 4205^2 + 616^2 .

It is an emirp because it is prime and its reverse (18416081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18061481 - 2¹⁰ = 18060457 is a prime.

It is a super-2 number, since 2×18061481² = 652434191826722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18061487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9030740 + 9030741.

It is an arithmetic number, because the mean of its divisors is an integer number (9030741).

Almost surely, 2^18061481 is an apocalyptic number.

It is an amenable number.

18061481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18061481 is an equidigital number, since it uses as much as digits as its factorization.

18061481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 18061481 is about 4249.8801159562. The cubic root of 18061481 is about 262.3721814603.

The spelling of 18061481 in words is "eighteen million, sixty-one thousand, four hundred eighty-one".