18507241 has 2 divisors, whose sum is σ = 18507242. Its totient is φ = 18507240.

The previous prime is 18507227. The next prime is 18507259. The reversal of 18507241 is 14270581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 2547216 = 3995^2 + 1596^2 .

It is a cyclic number.

It is not a de Polignac number, because 18507241 - 2¹³ = 18499049 is a prime.

It is not a weakly prime, because it can be changed into another prime (18507941) 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, 9253620 + 9253621.

It is an arithmetic number, because the mean of its divisors is an integer number (9253621).

Almost surely, 2^18507241 is an apocalyptic number.

It is an amenable number.

18507241 is a deficient number, since it is larger than the sum of its proper divisors (1).

18507241 is an equidigital number, since it uses as much as digits as its factorization.

18507241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 18507241 is about 4302.0043003233. The cubic root of 18507241 is about 264.5131252547.

The spelling of 18507241 in words is "eighteen million, five hundred seven thousand, two hundred forty-one".