18514481 has 2 divisors, whose sum is σ = 18514482. Its totient is φ = 18514480.

The previous prime is 18514477. The next prime is 18514501. The reversal of 18514481 is 18441581.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 1540081 = 4120^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 18514481 - 2² = 18514477 is a prime.

It is a super-2 number, since 2×18514481² = 685572013398722, 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 (18514451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9257240 + 9257241.

It is an arithmetic number, because the mean of its divisors is an integer number (9257241).

Almost surely, 2^18514481 is an apocalyptic number.

It is an amenable number.

18514481 is a deficient number, since it is larger than the sum of its proper divisors (1).

18514481 is an equidigital number, since it uses as much as digits as its factorization.

18514481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 32.

The square root of 18514481 is about 4302.8456862872. The cubic root of 18514481 is about 264.5476131137.

Subtracting from 18514481 its reverse (18441581), we obtain a square (72900 = 270²).

The spelling of 18514481 in words is "eighteen million, five hundred fourteen thousand, four hundred eighty-one".